TFT Double Up Updates

HUD improvements supporting the Double Up gameplay update, covering team colors, badges, scoreboard, and the Gift Armory flow.

Double Up is TFT's cooperative game mode where two players fight side by side. This update overhauled the in-game HUD to better communicate team identity and shared state, from the color system that differentiates your partner's units from your own, to the redesigned scoreboard that works across desktop and mobile, and the Gift Armory flow that lets partners send items to each other mid-game.