21 com

Every bin carries a stripe on its head, and every parcel must land where that stripe allows. Welcome to 21 com, a sharp rule-based puzzle game where planning, logic and flawless execution lead to big wins!

THE SHIFT
A shift starts with parcels stacked in intake lanes and a row of bins waiting at the top of the yard. Tap a parcel, then tap its matching bin, or drag it across. A bin that cannot accept the parcel sends it back, registering a mistake. Clear every lane to complete your shift and keep your 21com winning streak going!

TEN RACKS OF RULES
150 shifts are grouped into 10 distinct racks that introduce new mechanics step by step:
01 Color Dock - one color per bin
02 Symbol Lane - bins read the stamped symbol
03 Twin Rules - color and symbol must both match
04 Fragile Bay - heavy parcels cannot follow fragile items
05 Heavy Stack - weight limits and heavy-only bins
06 Hidden Labels - unlabeled parcels reveal their rules upon moving
07 Buffer Shift - a tight bench forces strict order
08 Locked Bins - one bin waits for another to finish
09 Mixed Yard - color, symbol, weight and fragile rules combined
10 Master Sort - every rule active at once

THE BUFFER BENCH
When a parcel has no immediate landing spot, park it on the buffer bench. A live status line shows your progress, remaining capacity and warns if a dead-end is ahead, helping you adjust your strategy like a 21 com casino pro.

TOOLS ON THE FLOOR
✔ Undo takes back the last accepted move
✔ Hint suggests a logical next step and explains why
✔ Restart resets the shift at any time
✔ Rule Manual offers clear examples of every active rule

STARS AND THE DOCKET
Each shift features a par move count. Finish on par with zero mistakes to claim three stars. The shift docket records your move efficiency, mistakes, layout details and final performance verdict.

THE LEDGER & MAP
Track total shifts cleared, stars earned, timestamps of recent runs, rank trends and achievements. Access the Level Yard map to revisit any shift and polish your high score.

YARD SETTINGS
Tailor your experience with visual effect toggles, vibration controls and a dim Night Shift theme. 21com plays fully offline without requiring an internet connection. Optional supporter purchases are available, and all 150 shifts are completely free to play.