# Tilt Building > A physics game for iPhone. Numbered blocks fall onto a narrow floating platform, equal numbers merge into the next one up, and tilting the phone leans the gravity of the whole scene — so the tower you are building can walk off the edge. Free-form physics, no grid. - Platform: iPhone, iOS 17 or later, portrait, one hand - Developer: Nick Polkovnikov - Site: https://tiltbuilding.com - Support: support@tiltbuilding.com - Engine: Swift, SpriteKit physics, CoreMotion, GameKit. No third-party SDKs. - Network: plays fully offline; Game Center is optional - Data collection: none. No analytics, no ads, no accounts, no servers. ## How it plays A block drifts left and right above the platform. Tap to drop it; wait too long and it drops on its own where it was, so the skill is timing. Equal numbers merge (2 + 2 = 4) and each merge makes the new block bigger and heavier. Tilting the phone tilts the gravity vector, steering the falling block and leaning everything already stacked. A run ends when a block slides off the platform or the stack grows past the top of the screen. Difficulty ramps with score, not time: Stage 1 at 0 points through Stage 10 at 3,400 points. Each stage narrows the platform and shortens the drop window; from Stage 8 the platform starts to lean by itself. ## Content - 119 cosmetic skins in five slots: 40 block materials, 28 platforms, 28 backdrops, 13 colour palettes, 10 sound packs - A palette repaints all ten block levels at once; one palette (Prism) rotates its hue while you play - Every sound pack is synthesised on the device — the app contains no audio files - 40 player levels with milestone rewards: free skin tokens, gold, gems, and items that can only be earned - 12 Game Center achievements worth 760 points, plus one all-time global leaderboard - Ten difficulty presets from Zen to Insane, and a tuning panel exposing every gameplay constant as a slider ## Monetisation Cosmetic only. Gold is earned by playing and buys most of the locker. Gems are scarce and back a handful of Legendary items; level milestones grant them and they can also be bought: $0.99 for 60, $2.99 for 170, $4.99 for 340, $9.99 for 900. A Starter Pack ($0.99) and a Supporter Bundle ($4.99, double gold forever) are one-time purchases. Nothing purchasable affects physics or scoring. ## Pages - https://tiltbuilding.com/ — what the game is, how it plays, the locker, progression, Game Center, purchases, FAQ - https://tiltbuilding.com/support — troubleshooting tilt, Game Center, purchases and progress; contact - https://tiltbuilding.com/privacy — privacy policy (no data collected) - https://tiltbuilding.com/terms — terms of use: Apple's standard licence, cosmetic-only purchases, refunds through Apple - https://tiltbuilding.com/press — fact sheet, screenshots, icon, quotable copy