• Choose your opening with visual mini maps. • Explore the starting position in 2D, 3D or 4D before confirming a new game. • Enjoy a refined glass preview with distinct Start and Close controls. • Follow spatial boards more easily with clearer lines and selection rings.

• Build a daily practice habit with streaks and a Home screen streak indicator. • Explore 102 puzzles across five learning levels, including challenges that explain movement in 3D and 4D. • Free players can solve a set of three puzzles. Unfinished puzzles stay available; the next set opens the day after all three are solved. Fourfold Plus unlocks all puzzles. • Enjoy clearer Learn navigation, challenge results and promotion choices. • Catch up with a new What’s New screen that includes updates from versions you skipped.

Watch the new App Store preview to see 4D Chess in action. Gameplay and features are unchanged from version 0.4.

Version 0.4 adds an iPhone Duo layout pairing a flat 2D board with a spatial 3D/4D board. Switch sides without losing your selection. Home, Learn, Rules, and Profile, plus board-based lessons and studies, adapt to the Duo layout. Subscription options refresh more reliably. Other iPhones and iPads keep their existing layouts.

Updated age-rating information for our casual chess experience.

• Play online: create a private room, join by code or QR, or find an opponent. Choose untimed, 5-minute or 10-minute games. • Explore Fourfold Plus with monthly and yearly plans: Full helper, deeper analysis, personal practice and advanced 4D Academy exercises. • Revisit positions in Study, organise notes and collections, and follow your practice activity. • Discover expanded onboarding, animated 2D-to-4D examples, smoother piece movement and clearer game results. • Core games, online play, Quick helper and existing lessons remain free.

• Create a private player profile with Apple, Google, or guest sign-in. • Choose a display name and a chess avatar inspired by four-dimensional space. • Explore the expanded four-space 8×8 board. • Enjoy clearer board miniatures, refined layouts, and smoother perspective transitions. • Continue playing against the computer or with a friend on the same device, without an account.