Control colourful balls through mysterious corridors, starry night skies, and misty forest levels. Simple rules, soothing BGM, and a skip function make this perfect for first-time action game players.
Rainbow Ball employs a single-finger control scheme that allows players to roll spherical objects through three-dimensional environments. The physics engine creates realistic ball movement with momentum and gravity effects visible through the gradient highlights on each ball's surface. The top-left highlight on most balls indicates the light source direction, adding depth perception crucial for spatial navigation.
The game utilises six distinct ball colours, each serving both aesthetic and functional purposes. The bright orange ball appears as the largest at 35 pixels diameter with a vertical oval shape, making it easier to track in darker environments. Conversely, the lemon yellow ball at 15 pixels diameter presents increased difficulty due to its smaller size. The grass green ball strategically blends with the forest level's dark green background, creating camouflage-based challenges.
The 29 stages are distributed across 6 thematic worlds, with completion tracked through the "1-1Clear" notification system showing world number and stage number. The blue square UI elements in the top corners provide consistent access to the freeze function (showing "90" uses available) and settings gear icon. Character portraits at screen bottom with circular frames in pink, green, and brown colours mark checkpoint progress.
Dark corridor levels use vertical grey stripes of varying widths to create forced perspective, simulating tunnel depth. Forest environments employ dense green mist with fern and tropical plant silhouettes at the bottom edge. Night sky stages feature black backgrounds with bluish tints, five-pointed yellow stars with glow effects, and blue planets with Saturn-style rings positioned in lower corners.
The skip function addresses difficulty spikes, particularly valuable given the 4+ age rating. The control panel at screen bottom includes five icons: circular arrow for restart, two vertical bars for pause, speaker for sound adjustment, an additional utility icon, and four arrows from centre for fullscreen mode. This comprehensive control suite accommodates various play styles and skill levels.
Requires iOS 11.0 or later for iPhone and iPod touch. Mac compatibility demands macOS 11.0 or later with Apple M1 chip minimum. Apple Vision support available with visionOS 1.0 or later. The 154.6 MB file size indicates substantial graphical assets supporting the game's vivid colour palette and 3D rendering.
Background music provided by Amacha's Music Studio creates the soothing atmosphere emphasised in marketing materials. The audio design complements the "fun and relaxing gameplay" whilst maintaining engagement across extended play sessions through 29 stages.
Free-to-play with no data collection according to developer Sasaki Keisuke's privacy policy verified in the App Store listing. This approach prioritises accessibility whilst maintaining the complete 29-stage experience without paywalls.