40 lines. One clean run.
F = 1/60 second. Infinite SDF moves to the floor without locking. Linear gravity adds a constant falling speed each minute in Zen / 40L (custom training rule). Blitz uses level-based gravity. Lock delay is fixed at 500 ms. TETR.IO sounds load automatically; synthesized cues are the fallback.
Choose your full album files; they stay in this browser. No upload. Official full album · Listen on Apple Music
No album loaded.
Music off · Phantom Memories — Dr Ocelot · TETR.IO Floor 5 in-game arrangement.
These rules apply on the next Zen start/restart. Timed modes keep the standard 10 × 20 board. Backfire returns base line/spin attack × amount; it is a training rule, not multiplayer damage calculation.
Undo/redo and its random stream are saved with your Zen game. Finesse analysis measures open-stack tap/DAS/rotation efficiency; obstructed spawns and tucks are excluded instead of marked as faults.
No import is required. To replace the default pack, save TETR.IO’s official sound pack, then select it below. Right-click the link and choose Save link as…; keep the .rsd extension. No export from TETR.IO settings is needed. Optional custom imports stay in this browser and are never uploaded. The default pack loads automatically on every browser.
Original synthesized cues active.
Click a binding, then press a key. Escape cancels. Duplicate bindings are rejected.
Measures browser frame delivery, not remote-display latency. Nothing is uploaded.