Deep Sea Duo Family Learning Game

Build a playable co-op learning game for one parent and one child on a single screen. Take turns diving deeper: the child answers kid-level questions, the parent gets harder ones, and every answer reveals a fun fact. A shared oxygen meter, animated submarine and Talk Time conversation cards turn quiz time into family bonding. One HTML file, no libraries. Works in Claude Code, Codex or Cursor. Easy to customize: change age, subject and theme (space, jungle, dinosaurs).