I built an Ori-style platformer with GPT Image 2.5, Tripo and Claude Opus 5.5, and it runs on desktop and on a phone. The whole thing comes down to one rule. Make it exist first. Make it good after. What came out: a night storm, wrecked ships, piers, buoys, and one glowing giant you have to read before it hits you. The order: Step 1 -> Mood boards in GPT Image 2.5: storm, piers, wrecks, one boss that glows. Step 2 -> Tripo P2 turns the mockups into 3D: the giant, the ships, the piers, the buoys. Step 3 -> Blender cleanup: scale, pivots, low poly so a phone can hold 60 fps. Step 4 -> The hero stays 2D: a run, jump, attack sprite dropped into the 3D world. Step 5 -> Opus 5.5 writes the game: movement, jumps, camera, rain, water. Step 6 -> The boss gets one readable rule: the giant's light shows where the fist lands. Step 7 -> SFX and music from ElevenLabs, at the very end. Step 8 -> Deploy to Vercel, send the link, watch people die to the giant. The split: > GPT Image 2.5: every mood board. > Tripo + Blender: every model. > Opus 5.5: the code, the camera, the weather. > ElevenLabs: everything you hear. > Me: play the grey box and decide what stays. Ship the ugly version that works before you polish anything. A playable grey box beats a beautiful mockup every single time.