First release.
The line runs one way. Tap a piece and it joins the back; only the front three are ever judged, and they clear when every attribute is all-same or all-different.
Three depths, from a colour-only tutorial to a six-wide board with facing arrows. One daily puzzle, the same for everyone, one attempt.
No ads, no in-app purchases, no account. Queueit is bought once, and it plays with no connection at all.