Slide it. Dock it. Line it.
Pieces enter from any of the four sides, slide across the board and stop against whatever they hit. There is no gravity — when a piece leaves, the hole stays. Line up three that agree, and they go.
A trio clears when each attribute is all the same or all different. The attributes are judged separately — colour can be all-same while the shapes are all-different. One attribute out of step and nothing happens.
✓ Clears
Three colours, three shapes, orders 1‑2‑3, three arrows. Every attribute is all-different, so every attribute agrees.
✗ Doesn't clear
Two reds and a blue. Every failure in Dockit is the same shape: some attribute splits two-and-one.
Red, blue, yellow — each tile also carries its initial, so the rule never depends on hue alone.
Circle, square, triangle, drawn as an outline you can read at a glance.
One, two or three. Read 1‑2‑3 or 3‑2‑1 along a line and it scores double.
The fourth attribute. Free play uses three; the arrow makes it the full puzzle.
The slide decides where the piece lands, which is the whole tension: you commit to a line and live with where it stops.
The row or column lights up and a ghost shows exactly which cell the piece will reach.
The piece runs until something blocks it, then settles in the last free cell. Aim the same row from the other side and it lands somewhere else entirely.
Tap a docked piece and it slides back out to the rail — if it still has a clear road to an edge. You get five pull-backs, and every line you clear buys one back.
One seed for the whole world, rolling over at midnight UTC so nobody's time zone gets a head start. Everyone plays it on the full four-attribute rule, on the 6×6 board, for the same 60 moves — the daily is the ranked mode, and it doesn't care what you've paid.
Dockit is free to play, on iPhone and on Android. Dockit Pro is a single purchase on either store — one payment, no subscription, nothing that expires.