Block Overlap

Drag blocks from the side palette onto the board. Overlapping regions blend automatically. Build the target colour pattern. Shape-cut blocks (late campaign) subtract regions rather than adding them.

Block Overlap is a spatial-reasoning puzzle where you stack 2D blocks with transparency so that overlapping regions form a target pattern. The format is reminiscent of pixel-art layering tools and adds a puzzle layer to what would otherwise be a creative-mode toy.

What works is the colour-blend logic. Two transparent blocks of different colours, when overlapped, produce a third colour predictable from a simple blend rule (red plus blue equals purple, and so on). The blend palette is small enough to learn (six base colours yielding fifteen unique blend results), and the rules are consistent so the puzzles are reasonable to think through.

Sixty levels across three colour-set themes. Early levels use two-block compositions. Mid-campaign introduces three-block stacks where the order of stacking matters because of one-way colour absorption, and the late campaign adds shape-cut blocks that subtract regions rather than adding them. The mechanical depth grows steadily through the campaign.

Tested over five commute sessions on the Mumbai locals plus weekend Bandra cafe sessions. Touch with drag-to-stack works beautifully. Mouse with drag-to-stack also works well. The format is fundamentally a manipulation puzzle, and either input is comfortable. No gamepad support, which is appropriate.

Where the design earns its four stars is the colour-blind accessibility. The colour-blend palette has high contrast and the blends include a pattern overlay for players who cannot distinguish certain colour pairs. This is the kind of accessibility design that puzzle games often skip and that the format here was clearly designed around from the start.

Where I would push back is the level-skip option, which lets you advance past any level without solving it. This is friendly for casual players but undermines the difficulty progression. Locking advancement behind solves (with the option to retry indefinitely) would have been the better design.

Four stars. Strong spatial-reasoning puzzle with thoughtful accessibility and reasonable mechanical depth. Recommended for puzzle players who enjoy thinking in layers.