A pocket logic transmission

Signal
Stack

Place the two-tone pieces. Complete rows and columns. Match the numbered signal for a clean transmission—and keep the channel alive.

score 000000
best 000000
chain ×0
1 Pick a piece · 2 tap it again to rotate · 3 tap its center.

Fill any row or column to clear it. Edge number = green-cell bonus.

incoming pieces
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How to play ▸
About Signal Stack · 关于此游戏

An endless two-tone logic game

Signal Stack is a free endless browser puzzle in the spirit of tetromino games, but calmer. Two-tone pieces appear in a tray — you pick one, rotate it, and tap the board to place it. Fill any full row or column to clear it. Each row and column has a small number on the edge: match that number with the count of green cells in the line and you score a Clean Signal bonus. The game ends when no piece in the tray can fit on the board. There is no account, no ad, and no streak — just one endless channel you keep alive for as long as you can.

How to play

  • Select one of the three available pieces.
  • Tap the selected piece again to rotate it 90°.
  • Tap the board to place it. Fill a full row or column to clear it.
  • Match a line's edge number with green cells for a Clean Signal bonus.

How to play

  1. Pick one of the three pieces in the tray.
  2. Tap the selected piece again to rotate it 90°.
  3. Tap the board to place it. Fill a full row or column to clear it.
  4. Match a line's edge number with the count of green cells for a Clean Signal bonus.
  5. Keep placing until no tray piece fits — then the channel closes.

Tips

  • Keep the center workable — don't stack tall against one wall.
  • Save rotation-friendly pieces for tight gaps; check all three before placing.
  • Chase Clean Signal bonuses on short rows first — they are easier to match.
  • Leave at least one column clear as an escape valve for awkward pieces.
  • The game ends when no tray piece fits, so plan two placements ahead.

Why this game is different

Endless, no streak, no account. Signal Stack adds a two-tone scoring layer on top of line-clear placement, wrapped in a retro console aesthetic. It is an endless logic puzzle you can pick up for a minute or an hour — close the tab and a fresh channel begins next time. Bilingual (English and 简体中文).

FAQ

Is Signal Stack free?
Yes. It is completely free to play in your browser — no payment, no ads, no hidden purchase.
Do I need an account?
No account is needed. Open the page and start placing pieces immediately.
Can I play on my phone?
Yes. The game is designed for one-thumb tap play and works on mobile and desktop browsers.
Is there a daily new puzzle?
Signal Stack is an endless mode — every run is different, with pieces and placements you control. There is no fixed daily board.
How is my progress saved?
Your best score stays on your device automatically. Individual runs do not persist — close the tab and a fresh channel begins next time.

Who is it for

For people who like line-clear games (tetromino variants, 1010!, block puzzles) but want an endless, low-stakes version. The two-tone scoring adds a small logic layer on top of placement. Works on mobile (one-thumb tap) and desktop. Bilingual: English and 简体中文.