How to Play Mono Stack Blocks - Step by Step
The Mono Stack Blocks page loads a ~58 KB line-clear stack in an iframe. Stack tetrominoes, clear rows, and chase level-ups. Press Play to start.
Step 1 - press Play
Press Play to inject the iframe (~58 KB). The engine auto-opens the stack game. Upstream is the Cursor Arcade blocks module by flancast90 (MIT).
Step 2 - stack and clear
Move pieces left and right. Soft drop with Down adds 1 point per cell. Hard drop with Space locks instantly and adds 2 points per cell dropped. Full rows clear for 100/300/500/800 times your level.
Step 3 - hold and ghost
Press C or Shift once per piece to swap with hold. A ghost shows where the piece lands. Level rises every 10 lines and gravity speeds up.
Step 4 - pause and restart
P opens pause overlay. R restarts the grid. Esc returns to the one-game menu.
Step 5 - scores
Game-over submits your score to ftol:monostackblocks:storage. Reset all high scores clears them from Settings.
| Setting | Value | Notes |
|---|---|---|
| Download | ~58 KB | arcade shell + blocks + CSS |
| Grid | 10 x 20 | 7-bag randomizer |
| Saves | localStorage | ftol:monostackblocks:storage |
| Server calls | 0 | Client-side only |
See when to play, comparisons, and Hex Puzzle Blocks.
Why trust these tools
- Ten-plus years of web tooling. The freetoolonline editorial team has shipped browser-based utilities since 2015. The goal has never changed: get you to a working output fast, without an install.
- No install, no sign-up. Open a tool and get a working output in seconds - nothing to download and no account to create. Tools that need heavy processing run it on our service, so even a low-powered machine gets the job done.
- Analytics stops at the page view. We measure which pages get visited, not what you type or upload inside a tool. There is nothing to sign in to and no profile is attached to your input.
- Open-source core components. The processing engines underneath (libheif, libde265, pdf-lib, terser, clean-css, ffmpeg.wasm, and others) are public and audit-able. We link to each one in its tool page's footer.
- Free, with or without ads. All tools are fully functional without sign-up. The Disable Ads button in the header is always available if you need a distraction-free run.