Tetris, but you control TWO boards simultaneously. One thumb per grid. Both drop at the same time. It sounds manageable — it really isn't at first, which is exactly why it's addictive. The split-brain challenge is unlike anything else: suppress the instinct to focus on one board, develop peripheral vision for blocks. Built solo in SwiftUI. Free to try, $0.99 one-time unlock. No subscriptions, no ads.