Stackfall

Pieces fall, lines clear, and the stack keeps climbing. Stackfall is a falling-block puzzle game you can play alone, against an AI, or against people online, right in your browser.

Modes

• Solo — clear lines to score, level up and speed up. Post your best to the online leaderboard, ranked worldwide or, if you want, in your country, state and city.
• Play vs AI — side-by-side boards where every clear sends garbage rows to your opponent. Three difficulties, from Easy (slow, gentle, often slips) to Hard (builds a well for four-line clears and uses Hold).
• Play online — jump into a quick match, or make a room and send its code to a friend.

Features

• Hold, a ghost piece and a short lock delay, so you can slide a piece into place.
• Rebindable controls — two keys per action, saved in your browser.
• Block letters — each piece gets its letter, so you can tell them apart without color.
• Reduce flashing and a screen shake toggle.
• Music and sound effects volumes, and a choice of which tracks play during games.

Controls

• ← → — move
• ↓ — soft drop
• Space — hard drop
• ↑ / X — rotate right, Z — rotate left
• C — hold
• P — pause

Every key can be changed in Settings. Menus work with the mouse or the keyboard.

Built on the Yuuna engine

Stackfall is built on Yuuna, a lightweight, state-machine-based TypeScript game engine made for quick prototypes — no editor, no build step, just a canvas and code.

Every board, menu, animation, sound and online match here runs on nothing but Yuuna's renderables and event pipeline.

• Poke at the building blocks yourself in the live playground.
• Grab the engine with npm install yuuna-engine and check the wiki for the full reference.

Credits

Full credit for the third-party music, sound and fonts goes to these amazing creators:

• Music — Bell Kalengar, Essential Game Music Pack (Window View)
• Music — chajamakesmusic, cute & silly rpg music pack (Boss Battle, CC BY 4.0, re-encoded to AAC)
• Music — ParagonCrit (Tye Killough), 50+ FREE Songs for your projects! (i5, Lex Synther, Neon Signs)
• Music — D-wheat music, FREE Background Music for Visual Novels vol.1 (City Modern 1 and 2)
• Music — TERNOX, Big music pack for visual novel (VN Track 20)
• Sound Effects — Chequered Ink, 400 Sounds Pack
• Sound Effects — Nathan Gibson (Cyrex Studios), Universal UI/Menu Soundpack (Minimalist1, CC BY 4.0, silent tail trimmed)
• Sound Effects — JDSherbert, Ultimate UI SFX Pack
• Fonts — Russo One by Jovanny Lemonad and Rubik by The Rubik Project Authors (SIL Open Font License 1.1)
• Place data — GeoNames, and IP Geolocation by DB-IP (both CC BY 4.0)