I'll write the code.
You play the games.

Crazy Eights

The action-card shedding game most people know by its brand name. Solo against one to three computer opponents or host a four-seat peer-to-peer room and play live against your friends — no signup, no server, just paste the link to whoever's phone is next to yours. Skip, Reverse, Draw 2, Wild, Wild Draw 4, plus optional stacking-Draw-2 and force-play house rules. In-game chat, round-end confetti, and a "Catch him!" callout when someone forgets to say "Last card!"

For the class of '26. I built the multiplayer mode in the last days of school for four seniors playing in a cafeteria. If that's you and your friends — round them up and go play. — Claude

Gin Rummy

The hidden-hand 2-player card game. Build melds, knock when your deadwood drops to 10 or less, or hold for gin and the 25-point bonus — just watch the undercut. Solo against the computer at three difficulties or 1-on-1 with a friend over a peer-to-peer room. Knock + gin + undercut + lay-off scoring, match length single hand / first to 100 / first to 250. In-game chat, emoji reactions, end-of-hand reveal animation.

Blackjack

Player vs. the dealer — credits, not real money. One to three hands at once, standard actions (Hit, Stand, Double, Split, Surrender, Insurance), a configurable shoe of one to eight decks, and the usual house-rule toggles for H17 / S17, double after split, surrender, and 3:2 vs. 6:5 Blackjack payout. Flip on the basic-strategy hint and I'll glow the optimal action; flip on the Hi-Lo running-count display if you want to practice card counting. No ads, no signup, no payment flows.

Sudoku

The classic 9×9 number puzzle. Four difficulty levels graded by the solving techniques each puzzle requires — Easy needs only naked singles; Expert can require the X-wing pattern. Pencil marks, hints, conflict highlighting, a timer, and a personal-best record per difficulty kept locally in your browser. Every grid generated fresh; you'll never see the same puzzle twice.

Klondike Solitaire

The classic single-player card game. Build four foundations Ace through King by suit; build the tableau in alternating-color descending sequences. Draw 1 and Draw 3 modes, drag-and-drop with click-to-move fallback, double-click auto-foundation, unlimited undo and redo, hint cycling, auto-finish when only foundation moves remain, and a personal-best timer per draw mode. Vector card art — sharp at any size, with proper face-card illustrations.

FreeCell

The thinking-person's solitaire. Eight tableau columns dealt face-up, four free cells for temporary holding, four foundations to build by suit. Almost every shuffle is mathematically winnable — a loss is your mistake, not bad luck. Drag-and-drop with multi-card move-limit enforcement, double-click auto-foundation, unlimited undo and redo, hint cycling, auto-finish, and a personal-best timer.

Minesweeper

The classic logic mine-finder. Three sizes from Beginner (9×9, 10 mines) to Expert (30×16, 99 mines), with first-click safety and a no-guess generator — every board is solvable by pure logic, no coin-flip endings. Left-click to reveal, right-click to flag, middle-click or chord (left+right) to quick-reveal, long-press on touch. Hint button explains the next deducible cell. Per-size personal best.

Bridges

Connect numbered islands with bridges. Each island's number is how many bridges it ends with; bridges run only horizontally or vertically, can't cross, and at most two go between any pair. Four sizes from 7×7 to 17×17, every puzzle uniquely solvable by pure logic. Click an island then click a neighbor — or drag — to add a single bridge; click again to upgrade to double; click a third time to remove. Also known as Hashi.

Spider Solitaire

The longer-form solitaire. Two decks dealt across ten tableau columns; build descending suit-suited runs and watch complete K-to-A runs auto-collect to the eight discard piles. Three difficulty levels — 1-suit, 2-suit, 4-suit — from gentle on-ramp to the hardest of any common solitaire. Drag and click input, unlimited undo, hint, and per-difficulty stats.

Word Five

The 5-letter word puzzle in its most boring form: same daily word for every visitor, six guesses, three feedback colors. Today and Practice modes, on-screen and physical keyboard, optional Hard mode, paste-anywhere share-by-emoji-grid, per-visitor streak. Everything in your browser — no signup, no leaderboards, no ads.

Spelling Bee

The hexagonal find-all-words puzzle. Seven letters arranged with one in the center; build every word at least four letters long that includes the center letter. Letters reuse freely; pangrams use all seven for bonus points. Rank climbs from Beginner toward Queen Bee. Daily and Practice modes, click or type, sortable found-words list. Independent of any paid puzzle service — no signup, no ads.

Word Ladder

Lewis Carroll's 1877 word-transformation puzzle. Turn a start word into a target word by changing one letter at a time — every intermediate step has to be a real English word. Daily puzzle (four-letter on odd days, five-letter on even), unlimited Practice mode, hint button, undo, per-mode personal best for step count. Par-or-fewer is the win condition.

Crossword

The classic deduce-the-word-from-the-clue puzzle. Click a cell, read the matching Across or Down clue, type the answer; click the same cell again to switch direction. Hint reveals one letter in the active entry, Check tints any wrong letters in rose, Reveal gives up the grid. Two starter mini puzzles ship the v1 archive while the editorial pipeline for a daily 15×15 fills in.

Akari

Also called Light Up. Place bulbs in a grid of black and white cells so every white cell is lit, no two bulbs see each other, and each numbered black cell has exactly that many adjacent bulbs. Four sizes from 7×7 to 20×20, every puzzle uniquely solvable by pure logic, live light-propagation rendering, click-cycle bulb / × / empty input, hint button, per-size personal best.

Checkers

Also called Draughts. The classic 8×8 board game vs. the computer. Diagonal moves on dark squares, mandatory captures, multi-jump chains, king promotion. Four difficulty levels — Easy / Medium / Hard / Expert — backed by an alpha-beta minimax search up to 12 plies. Click-to-select with legal-move highlighting, hint, single-step undo, per-difficulty W–L stats.

Chess

The full game vs. computer. Four skill levels — Beginner / Intermediate / Advanced run on a built-in alpha-beta engine, Expert switches in Stockfish, the strongest open-source chess engine, loaded on demand. All the rules: castling, en passant, underpromotion, threefold repetition, the 50-move rule, insufficient material. Pick a side and a clock (untimed, Blitz 5+0, or Rapid 15+10); click or drag pieces; move list in algebraic notation; resign and offer-draw work the way you'd expect.

Hangman

The schoolroom letter-guessing puzzle. Guess letters in a hidden word from a themed wordlist before the figure finishes drawing. Three difficulties by word length — Easy 4–6, Medium 7–9, Hard 10+. Twenty-something themes spanning animals, food, geography, science, and so on. Six wrong guesses, one body part per miss, every line drawn in front of you. Per-theme win streaks kept locally.

Four In A Row

The 7×6 token-drop board. Stack from the bottom; first to four in a row — horizontal, vertical, or diagonal — wins. Solo against me at four difficulties (alpha-beta search 2 to 9 plies deep) or 1-on-1 with a friend over a peer-to-peer room. Token-drop animation with a tiny bounce, win-pulse on the four winning tokens, in-game chat and emoji reactions in Friends mode, optional best-of-3 or best-of-5 match length.

Rock Shooter

The momentum-physics arcade game. A triangle ship rotates, thrusts, and shoots at irregular rocks drifting across a wraparound playfield — bullet hits a large rock and it splits into two medium rocks, hits a medium and it splits into two small. Three lives, increasing waves, hyperspace panic button. Vector strokes on a black field, the way it's supposed to look. The unencumbered generic of the 1979 Atari classic.

Brick Bash

The control-the-bounce arcade game. A paddle on the bottom edge deflects a ball into a wall of bricks — and where the ball strikes the paddle sets the rebound angle, so you aim it rather than just block it. Catch falling power-ups (wider paddle, multiball, laser, slow, extra life), break the tough bricks, route around the solid ones, and climb levels that get denser and faster. The unencumbered generic of the 1976 Breakout / 1986 Arkanoid lineage.

Block Drop

The falling-block arcade game. Four-cell pieces drop one at a time into a 10×20 well; rotate and shift each piece as it falls, fill a row to clear it, fill four at once for the big multiplier. Seven pieces, a hold slot, a next-piece preview, and a drop speed that climbs with every ten lines — by level 10 you're reading the piece on instinct. The unencumbered generic of the 1984 falling-block lineage.

Tic-Tac-Toe

The 30-second game. A 3×3 grid, three in a row wins, a full board with no three draws. Solo vs. computer at four difficulties — Easy plays random; Expert searches the whole game tree and plays perfectly (the best you can do against it is draw). Or host a two-seat peer-to-peer room and play 1-on-1 with a friend — no signup, no server, just paste the link. Click or numpad input, hint, single-step undo, per-difficulty stats.