Level 1
❤️❤️❤️
🏓 0/4
👆 Single: ✖ ✌️ Double: 🏓
🏓

1. One per line

Exactly 1 Dong per row & column

🎨

2. One per territory

Exactly 1 Dong per colour block

🚫

3. No touching

Dongs never touch (diagonals too)

Keyboard: Enter toggles the ✖ exclude mark, Shift+Enter places a 🏓 Dong.