Core gameplay
Blocks appear in eight distinct colours. A row clears only when it contains all eight colours exactly once. Blocks cannot be moved after landing.

Level and content structure
One hundred fixed puzzles. Each puzzle specifies which rows must be cleared in order. Later puzzles include pre-filled rows with duplicate colours.

Visual and user experience
Each colour corresponds to a specific block texture (dots, stripes, crosshatch). Colour names are shown on the side panel. No flashing or rapid colour changes.

Features
A colour checklist shows which colours are missing from the current row. No time limits or move penalties.

User value
Encourages forward planning across multiple rows. Suitable for users who prefer completion-style tasks.

Usage scenario
Longer breaks such as weekend afternoons.