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Puzzles
Classic Puzzle - Hard
To start
The Labyrinth
XP
+250 XP
Completed by 8,369 CodinGamers
0
done
Death First Search - Episode 2
Death First Search - Episode 2
XP
+250 XP
Completed by 7,034 CodinGamers
0
done
The Bridge
XP
+375 XP
Completed by 3,750 CodinGamers
0
done
Winamax Sponsored Contest
XP
+250 XP
Completed by 2,123 CodinGamers
0
done
Don't Panic - Episode 2
XP
+250 XP
Completed by 1,619 CodinGamers
0
done
Vox Codei - Episode 1
XP
+250 XP
Completed by 2,538 CodinGamers
0
done
Super Computer
XP
+250 XP
Completed by 5,281 CodinGamers
0
done
Roller Coaster
XP
+375 XP
Completed by 7,111 CodinGamers
0
done
Surface
XP
+250 XP
Completed by 4,944 CodinGamers
0
done
CGX Formatter
XP
+250 XP
Completed by 4,390 CodinGamers
0
done
Power of Thor - Episode 2
XP
+250 XP
Completed by 1,893 CodinGamers
0
done
There is no Spoon - Episode 2
XP
+250 XP
Completed by 1,555 CodinGamers
0
done
The Fall - Episode 2
The Fall - Episode 2
XP
+250 XP
Completed by 1,269 CodinGamers
0
done
TAN Network
XP
+250 XP
Completed by 2,609 CodinGamers
0
done
Genome Sequencing
XP
+250 XP
Completed by 4,111 CodinGamers
0
done
Blunder - Episode 2
Blunder - Episode 2
XP
+250 XP
Completed by 3,432 CodinGamers
0
done
Blunder - Episode 3
Blunder - Episode 3
XP
+250 XP
Completed by 2,135 CodinGamers
0
done
Puzzle of the Week
Let's make a cheap ASCII 3D engine!
by pardouin
Let's make a cheap ASCII 3D engine!
XP
+50 XP
Completed by 154 CodinGamers
0
done
3D Duck Hunt
by pluieciel
3D Duck Hunt
XP
+50 XP
Completed by 8 CodinGamers
0
done
Shape Recognition
by HossamEL2006
Shape Recognition
XP
+50 XP
Completed by 14 CodinGamers
0
done
Rummikub 2
by jddingemanse
Rummikub 2
XP
+50 XP
Completed by 21 CodinGamers
0
done
Tetris Floor
by cedricdd
Tetris Floor
XP
+50 XP
Completed by 22 CodinGamers
0
done
Simple Pascal (PL/0) Compiler
by JDOnline
Simple Pascal (PL/0) Compiler
XP
+50 XP
Completed by 18 CodinGamers
0
done
Mind Cracker
by Humanosaure
Mind Cracker
XP
+50 XP
Completed by 38 CodinGamers
0
done
Breaking Bifid
by therealbeef
Breaking Bifid
XP
+50 XP
Completed by 50 CodinGamers
0
done
Derivative time !!! - part2
by pluieciel
Derivative time !!! - part2
XP
+50 XP
Completed by 49 CodinGamers
0
done
Mrs. Knuth - Part III
by Timinator
Mrs. Knuth - Part III
XP
+50 XP
Completed by 23 CodinGamers
0
done
Sokoban
by eulerscheZahl
Sokoban
XP
+50 XP
Completed by 134 CodinGamers
0
done
Advertisements
by jddingemanse
Advertisements
XP
+50 XP
Completed by 27 CodinGamers
0
done
Solve for X
by Timinator
Solve for X
XP
+50 XP
Completed by 29 CodinGamers
0
done
Picture Puzzle
by Teiglin
Picture Puzzle
XP
+50 XP
Completed by 52 CodinGamers
0
done
String Balls II
by Timinator
String Balls II
XP
+50 XP
Completed by 27 CodinGamers
0
done
Killer Sudoku Extreme Challenge
by Timinator
Killer Sudoku Extreme Challenge
XP
+50 XP
Completed by 31 CodinGamers
0
done
Kakuro Solver
by Q12
Kakuro Solver
XP
+50 XP
Completed by 90 CodinGamers
0
done
The flight of birds
by Sirios
The flight of birds
XP
+50 XP
Completed by 14 CodinGamers
0
done
M.A.R.I. and the crazy factory
by nicola
M.A.R.I. and the crazy factory
XP
+50 XP
Completed by 29 CodinGamers
0
done
Conditional probabilities
by nicola
Conditional probabilities
XP
+50 XP
Completed by 62 CodinGamers
0
done
Haunted Manor
by [CG]jupoulton
Haunted Manor
XP
+50 XP
Completed by 147 CodinGamers
0
done
The Hidden Fortress
by pardouin
The Hidden Fortress
XP
+50 XP
Completed by 297 CodinGamers
0
done
Nonogram inversor
by LaurentBouvier
Nonogram inversor
XP
+50 XP
Completed by 134 CodinGamers
0
done
The Burglar's Dilemna
by [CG]Keelhaul
The Burglar's Dilemna
XP
+50 XP
Completed by 253 CodinGamers
0
done
Map Colorations
by DPAmar
Map Colorations
XP
+50 XP
Completed by 72 CodinGamers
0
done
Obsolete Programming
by Zorg1
Obsolete Programming
XP
+50 XP
Completed by 375 CodinGamers
0
done
Strobogrammatic Numbers
by undefined
Strobogrammatic Numbers
XP
+50 XP
Completed by 52 CodinGamers
0
done
8086 Assembler, part I
by JDOnline
8086 Assembler, part I
XP
+50 XP
Completed by 22 CodinGamers
0
done
Who Dunnit?
by DavidAugustoVilla
Who Dunnit?
XP
+50 XP
Completed by 22 CodinGamers
0
done
Einstein's riddle solver
by OroshiX
Einstein's riddle solver
XP
+50 XP
Completed by 223 CodinGamers
0
done
DAWG
by Westicles
DAWG
XP
+50 XP
Completed by 71 CodinGamers
0
done
Can you save the forest - Episode 2
by chabes
Can you save the forest - Episode 2
XP
+50 XP
Completed by 13 CodinGamers
0
done
Hexagonal Maze - part2
by Remi.
Hexagonal Maze - part2
XP
+50 XP
Completed by 84 CodinGamers
0
done
11-puzzle
by [CG]Maxime
11-puzzle
XP
+50 XP
Completed by 202 CodinGamers
0
done
Takuzu Solver
by vinc-r
Takuzu Solver
XP
+50 XP
Completed by 110 CodinGamers
0
done
Her Majesty's well shared secret
by Niako
Her Majesty's well shared secret
XP
+50 XP
Completed by 102 CodinGamers
0
done
Thomas and the Freight Cars
by java_coffee_cup
Thomas and the Freight Cars
XP
+50 XP
Completed by 280 CodinGamers
0
done
Zergling rush
by ValNykol
Zergling rush
XP
+50 XP
Completed by 686 CodinGamers
0
done
24: The Long Game
by jddingemanse
24: The Long Game
XP
+50 XP
Completed by 28 CodinGamers
0
done
Mars Colonization
by java_coffee_cup
Mars Colonization
XP
+50 XP
Completed by 206 CodinGamers
0
done
Factorials of primes decomposition
by nicola
Factorials of primes decomposition
XP
+50 XP
Completed by 225 CodinGamers
0
done
Chess cavalry
by Arglanir
Chess cavalry
XP
+50 XP
Completed by 716 CodinGamers
0
done
Blockout
by eulerscheZahl
Blockout
XP
+50 XP
Completed by 16 CodinGamers
0
done
Simon's Oracle
by DavidAugustoVilla
Simon's Oracle
XP
+50 XP
Completed by 17 CodinGamers
0
done
N Pearls Necklace
by pardouin
N Pearls Necklace
XP
+50 XP
Completed by 28 CodinGamers
0
done
Turing machine
by ValNykol
Turing machine
XP
+50 XP
Completed by 700 CodinGamers
0
done
SHA-256 Hash
by schachmatt
SHA-256 Hash
XP
+50 XP
Completed by 171 CodinGamers
0
done
Cubax Folding
by masterglob
Cubax Folding
XP
+50 XP
Completed by 91 CodinGamers
0
done
Magic count of numbers
by InstouT94
Magic count of numbers
XP
+50 XP
Completed by 494 CodinGamers
0
done
Fractal Carpet
by Sethius
Fractal Carpet
XP
+50 XP
Completed by 560 CodinGamers
0
done
Paper-folding curve
by java_coffee_cup
Paper-folding curve
XP
+50 XP
Completed by 514 CodinGamers
0
done
Doubly solved Rubik's cube
by icecuber
Doubly solved Rubik's cube
XP
+50 XP
Completed by 119 CodinGamers
0
done
Detective Pikaptcha EP4
by java_coffee_cup
Detective Pikaptcha EP4
XP
+50 XP
Completed by 207 CodinGamers
0
done
The Empire Enigma
by ReMoD
The Empire Enigma
XP
+50 XP
Completed by 250 CodinGamers
0
done
ASCII Art QR code
by Eulero314
ASCII Art QR code
XP
+50 XP
Completed by 74 CodinGamers
0
done
The Total is Right - Weird edition
by Alain-Delpuch
The Total is Right - Weird edition
XP
+50 XP
Completed by 290 CodinGamers
0
done
Breakout
by player_one
Breakout
XP
+50 XP
Completed by 86 CodinGamers
0
done
A Man with a Plan
by undefined
A Man with a Plan
XP
+50 XP
Completed by 85 CodinGamers
0
done
Cloudy Weather
by Niako
Cloudy Weather
XP
+50 XP
Completed by 74 CodinGamers
0
done
Chess board analyzer
by Di_Masta
Chess board analyzer
XP
+50 XP
Completed by 472 CodinGamers
0
done
A Game of Go
by Tux4711
A Game of Go
XP
+50 XP
Completed by 239 CodinGamers
0
done
Apple tree
by input.txt
Apple tree
XP
+50 XP
Completed by 803 CodinGamers
0
done
Grid climbing
by Rafarafa
Grid climbing
XP
+50 XP
Completed by 66 CodinGamers
0
done
Fold and cut
by NicknamedTwice
Fold and cut
XP
+50 XP
Completed by 21 CodinGamers
0
done
Dumbbells solver
by VilBoub
Dumbbells solver
XP
+50 XP
Completed by 169 CodinGamers
0
done
The Balanced Centrifuge Problem
by magaiti
The Balanced Centrifuge Problem
XP
+50 XP
Completed by 131 CodinGamers
0
done
Encounter surface
by BLANC
Encounter surface
XP
+50 XP
Completed by 148 CodinGamers
0
done
X egg problem
by Romario
X egg problem
XP
+50 XP
Completed by 227 CodinGamers
0
done
Jump Point Search - Preprocessing
by aCat
Jump Point Search - Preprocessing
XP
+50 XP
Completed by 103 CodinGamers
0
done
Mini sudoku solver
by nicola
Mini sudoku solver
XP
+50 XP
Completed by 1,057 CodinGamers
0
done
Misère Nim
by magaiti
Misère Nim
XP
+50 XP
Completed by 161 CodinGamers
0
done
Neighbor-Sum Grids
by Niako
Neighbor-Sum Grids
XP
+50 XP
Completed by 94 CodinGamers
0
done
Harmless Rooks
by Niako
Harmless Rooks
XP
+50 XP
Completed by 100 CodinGamers
0
done
Cryptarithm
by Bob
Cryptarithm
XP
+50 XP
Completed by 525 CodinGamers
0
done
Maximising integers
by SubwayMan
Maximising integers
XP
+50 XP
Completed by 161 CodinGamers
0
done
Dominoes solver
by VilBoub
Dominoes solver
XP
+50 XP
Completed by 174 CodinGamers
0
done
Laser and mirrors
by Arglanir
Laser and mirrors
XP
+50 XP
Completed by 374 CodinGamers
0
done
The hungry duck - part 2
by schubc
The hungry duck - part 2
XP
+50 XP
Completed by 879 CodinGamers
0
done
Gerrymandering
by MathisHammel
Gerrymandering
XP
+50 XP
Completed by 258 CodinGamers
0
done
Closest Number
by Nagrarok
Closest Number
XP
+50 XP
Completed by 141 CodinGamers
0
done
Max Rect
by java_coffee_cup
Max Rect
XP
+50 XP
Completed by 410 CodinGamers
0
done
Counter Attack
by The Capra Aegagrus Hircus 2000
Counter Attack
XP
+50 XP
Completed by 22 CodinGamers
0
done
Sliding Maze Puzzle
by pardouin
Sliding Maze Puzzle
XP
+50 XP
Completed by 21 CodinGamers
0
done
Three little piggies
by nicola
Three little piggies
XP
+50 XP
Completed by 56 CodinGamers
0
done
Boggle
by Bob
Boggle
XP
+50 XP
Completed by 552 CodinGamers
0
done
Cheat Solving
by JBM
Cheat Solving
XP
+50 XP
Completed by 223 CodinGamers
0
done
To Sky's Edge
by [CG]Keelhaul
To Sky's Edge
XP
+50 XP
Completed by 366 CodinGamers
0
done
Staircases
by sampriti
Staircases
XP
+50 XP
Completed by 658 CodinGamers
0
done
Erdős Number
by Delgan
Erdős Number
XP
+50 XP
Completed by 214 CodinGamers
0
done
Vortex
by MadKnight
Vortex
XP
+50 XP
Completed by 422 CodinGamers
0
done
Discrete Log Problem
by Maurice_Moss
Discrete Log Problem
XP
+50 XP
Completed by 112 CodinGamers
0
done
Binary neural network - Part 1
by player_one
Binary neural network - Part 1
XP
+50 XP
Completed by 187 CodinGamers
0
done
Binary Extension
by mouton5000
Binary Extension
XP
+50 XP
Completed by 69 CodinGamers
0
done
Order of Oopserations!
by Stashio
Order of Oopserations!
XP
+50 XP
Completed by 277 CodinGamers
0
done
Hitori solver
by VilBoub
Hitori solver
XP
+50 XP
Completed by 150 CodinGamers
0
done
Monte Carlo Tree Search exercise
by aCat
Monte Carlo Tree Search exercise
XP
+50 XP
Completed by 214 CodinGamers
0
done
Binary Permutations
by TheNinja
Binary Permutations
XP
+50 XP
Completed by 327 CodinGamers
0
done
Flower beds
by Fluxor
Flower beds
XP
+50 XP
Completed by 137 CodinGamers
0
done
Castle Siege
by TheNinja
Castle Siege
XP
+50 XP
Completed by 339 CodinGamers
0
done
Electrical grid
by qsantos
Electrical grid
XP
+50 XP
Completed by 327 CodinGamers
0
done
MAGICAL FROG
by berqiamouad
MAGICAL FROG
XP
+50 XP
Completed by 25 CodinGamers
0
done
Connect four
by Bob
Connect four
XP
+50 XP
Completed by 421 CodinGamers
0
done
Longest Palindrome
by Maurice_Moss
Longest Palindrome
XP
+50 XP
Completed by 846 CodinGamers
0
done
Kolakoski Sequence
by Orabig
Kolakoski Sequence
XP
+50 XP
Completed by 792 CodinGamers
0
done
Parsing context-free grammar
by aCat
Parsing context-free grammar
XP
+50 XP
Completed by 120 CodinGamers
0
done
The Beautiful sequence
by dogther
The Beautiful sequence
XP
+50 XP
Completed by 251 CodinGamers
0
done
Execution Circle
by Skreamly
Execution Circle
XP
+50 XP
Completed by 290 CodinGamers
0
done
Hill Notation and Hill Order
by btharper
Hill Notation and Hill Order
XP
+50 XP
Completed by 267 CodinGamers
0
done
The hungry duck - part 1
by schubc
The hungry duck - part 1
XP
+50 XP
Completed by 1,120 CodinGamers
0
done
Sum of odd
by dwarfie
Sum of odd
XP
+50 XP
Completed by 241 CodinGamers
0
done
Hit the road
by mouton5000
Hit the road
XP
+50 XP
Completed by 199 CodinGamers
0
done
Legendary Archer Octavius
by UnicornP
Legendary Archer Octavius
XP
+50 XP
Completed by 24 CodinGamers
0
done
The Holy Grail
by Blem
The Holy Grail
XP
+50 XP
Completed by 508 CodinGamers
0
done
CG Chat Interpreter
by player_one
CG Chat Interpreter
XP
+50 XP
Completed by 119 CodinGamers
0
done
Chess moves on FEN position
by scrauler
Chess moves on FEN position
XP
+50 XP
Completed by 323 CodinGamers
0
done
Spreadsheet Labels
by Porthos3
Spreadsheet Labels
XP
+50 XP
Completed by 694 CodinGamers
0
done
Pascal Trapezoid
by player_one
Pascal Trapezoid
XP
+50 XP
Completed by 141 CodinGamers
0
done
Mystery sums
by Neonox
Mystery sums
XP
+50 XP
Completed by 555 CodinGamers
0
done
Levenshtein distance
by Steuh
Levenshtein distance
XP
+50 XP
Completed by 649 CodinGamers
0
done
Wave Function Collapse (sans Shannon)
by Wontonimo
Wave Function Collapse (sans Shannon)
XP
+50 XP
Completed by 30 CodinGamers
0
done
Elevator
by dimpopo
Elevator
XP
+50 XP
Completed by 1,165 CodinGamers
0
done
Simple CPU Emulation 1
by SunMan
Simple CPU Emulation 1
XP
+50 XP
Completed by 702 CodinGamers
0
done
Horn-SAT solver
by ludowsky
Horn-SAT solver
XP
+50 XP
Completed by 117 CodinGamers
0
done
Balanced Levers
by java_coffee_cup
Balanced Levers
XP
+50 XP
Completed by 27 CodinGamers
0
done
Symbolic system of equations
by izanbf
Symbolic system of equations
XP
+50 XP
Completed by 100 CodinGamers
0
done
Jump Point Search - Runtime
by aCat
Jump Point Search - Runtime
XP
+50 XP
Completed by 67 CodinGamers
0
done
n Queens
by VilBoub
n Queens
XP
+50 XP
Completed by 610 CodinGamers
0
done
Hanoi tower
by Bob
Hanoi tower
XP
+50 XP
Completed by 535 CodinGamers
0
done
TXT2HTML
by Merome
TXT2HTML
XP
+50 XP
Completed by 421 CodinGamers
0
done
Hangman
by [CPC]glau
Hangman
XP
+50 XP
Completed by 798 CodinGamers
0
done
KGood
by _NikJ
KGood
XP
+50 XP
Completed by 800 CodinGamers
0
done
Simple safecracking
by Shomz
Simple safecracking
XP
+50 XP
Completed by 1,493 CodinGamers
0
done
Universe Conquest
by Enygma
Universe Conquest
XP
+50 XP
Completed by 140 CodinGamers
0
done
Candies
by Elliot
Candies
XP
+50 XP
Completed by 589 CodinGamers
0
done
Google Interview - The Two Egg Problem
by [CG]OlogN
Google Interview - The Two Egg Problem
XP
+50 XP
Completed by 2,061 CodinGamers
0
done
Breaking Apart
by Gorbit99
Breaking Apart
XP
+50 XP
Completed by 71 CodinGamers
0
done
Code your own Automaton2000, step 1
by Magus
Code your own Automaton2000, step 1
XP
+50 XP
Completed by 191 CodinGamers
0
done
Divisibility of Fibonacci numbers sum
by OPi
Divisibility of Fibonacci numbers sum
XP
+50 XP
Completed by 118 CodinGamers
0
done
Simplify Selection Ranges
by xmetrix
Simplify Selection Ranges
XP
+50 XP
Completed by 1,910 CodinGamers
0
done
Rocket mice
by player_one
Rocket mice
XP
+50 XP
Completed by 98 CodinGamers
0
done
Alternative vote
by [CG]Maxime
Alternative vote
XP
+50 XP
Completed by 489 CodinGamers
0
done
Expand the polynomial
by nicola
Expand the polynomial
XP
+50 XP
Completed by 686 CodinGamers
0
done
Inertia ride
by [CG]Keelhaul
Inertia ride
XP
+50 XP
Completed by 415 CodinGamers
0
done
The max surface box
by VinceKanabo
The max surface box
XP
+50 XP
Completed by 555 CodinGamers
0
done
Nuggets numbers
by Thib34
Nuggets numbers
XP
+50 XP
Completed by 262 CodinGamers
0
done
Bailey–Borwein–Plouffe Pi
by Zenoscave
Bailey–Borwein–Plouffe Pi
XP
+50 XP
Completed by 75 CodinGamers
0
done
Drawing Polygons
by PauloVilela
Drawing Polygons
XP
+50 XP
Completed by 418 CodinGamers
0
done
7-segment display
by scrauler
7-segment display
XP
+50 XP
Completed by 1,025 CodinGamers
0
done
Adversarial Mate with Rook
by aCat
Adversarial Mate with Rook
XP
+50 XP
Completed by 20 CodinGamers
0
done
The Highest Building
by Konrad_Wer
The Highest Building
XP
+50 XP
Completed by 422 CodinGamers
0
done
CG's Next Top Model
by Wontonimo
CG's Next Top Model
XP
+50 XP
Completed by 39 CodinGamers
0
done
The greatest number
by Magus
The greatest number
XP
+50 XP
Completed by 3,579 CodinGamers
0
done
Tetris
by Bob
Tetris
XP
+50 XP
Completed by 219 CodinGamers
0
done
Musical Intervals
by JBM
Musical Intervals
XP
+50 XP
Completed by 146 CodinGamers
0
done
Snooker Ball Collision
by Loufouh
Snooker Ball Collision
XP
+50 XP
Completed by 37 CodinGamers
0
done
🃏 FreeCell 🃏
by JBM
🃏 FreeCell 🃏
XP
+50 XP
Completed by 7 CodinGamers
0
done
Pedestrian Traffic
by tobakudan
Pedestrian Traffic
XP
+50 XP
Completed by 29 CodinGamers
0
done
Wall Street
by MasterJos
Wall Street
XP
+50 XP
Completed by 171 CodinGamers
0
done
Test before Validate!
by bloublou
Test before Validate!
XP
+50 XP
Completed by 417 CodinGamers
0
done
Secret Message Decoding
by csKingBabar
Secret Message Decoding
XP
+50 XP
Completed by 18 CodinGamers
0
done
Basic Decision Tree - 1
by Wei-1
Basic Decision Tree - 1
XP
+50 XP
Completed by 96 CodinGamers
0
done
Basic Decision Tree - 2
by Wei-1
Basic Decision Tree - 2
XP
+50 XP
Completed by 41 CodinGamers
0
done
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