• ✓Idea: teach one named mental-maths trick at a time
• ✓Collect 20 tricks, Friends-of-10 → L'Hôpital
• ✓Pick a level and a trick (or mix them all)
• ✓A "Teach me" lesson first + read-aloud
• ✓Type the answer + Enter, with a streak counter
• ✓A few misses → a breathe; Miro hosts
• ✓Fills the screen on phone & desktop
• ✓Keep adding new tricksplanned

✓ = done · ☐ = planned. Every game is built one step at a time like this.