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Grid Games

How to play

Gameplay

A single page bundling 6 related tools — The classic X/O showdown, Drop discs and line up four in a row., Challenge a simple AI or play against a friend, Split an image into 3x3 for moments, Draw lines on a dot grid and claim squares against a simple AI. and Flood the board with one color before moves run out.. Switch with the tabs above; each tool is fully usable here.

Controls

Pick a tab to load the matching tool. Everything you type stays in your browser; nothing is uploaded or saved on a server.

Board and Logic Puzzles

Graph theory, constraint solving, and puzzle math

Game Numerical Design

RPG formulas and growth curves, taming the idle exponential, elimination board structures, and pricing letter probabilities

Seven Algorithm Lessons from Games

Seven essays from pathfinding to game AI

Wordle, anagram, hangman, crossword and word games in one page.

CRT, scanline, TV static, VHS and Game Boy retro screen effects.

Metaballs, plasma, Lissajous, Voronoi, fractal and noise generative art.

Nonogram, Slitherlink, Hashi, Kakuro and logic puzzles in one page.

RPG combat, damage, monsters, logs, dungeons, skill-tree and a terminal text adventure.

Seven quick human-skill tests: visual field, colour vision, hearing, rhythm, bimanual coordination, keypad speed and letter recognition.