Two-tone capsules fall in primary colours, line them up, blend them into the secondaries you need, and wipe out every germ.
Chroma is a falling-capsule color-matching puzzle built around colour theory. Capsules made of two halves drop from the top in the primaries, red, yellow, and blue. Steer and rotate them to stack four or more of the same colour in a row or column to clear them. The signature twist: set two different primaries adjacent and they mix into a secondary colour, the only way to remove germs of that blended hue. Clear every germ on the board to beat the level.
Falling two-halved capsules, steered and rotated to line up colours, is Dr. Mario — Nintendo, 1990, produced by Gunpei Yokoi.
The original layer is colour theory. The capsules arrive in the primaries — red, yellow and blue — and setting two different primaries adjacent mixes them into a secondary.
That gives the well a chemistry Dr. Mario does not have. There, colours are just labels and adjacency means nothing; here a careless neighbour creates a colour you did not want and may not be able to clear, so placement has to account for what a block will become.
Chroma reimagines the falling-pill, germ-clearing puzzle genre with a colour-mixing layer, so beating a level means thinking like a painter as well as a stacker. It is an original, free browser game built in-house for PlayPendium.