The game works but has several issues:

**Issues Found:**
1. **Collision detection is imprecise** - checking if mouse is within `block.pos[0] < mx < block.pos[0] + 3*CELL` doesn't account for actual block shape
2. **No scoring system** - cleared lines don't contribute to score
3. **Single block only** - only one block at a time instead of multiple choices
4. **Line clearing bug** - the algorithm doesn't properly handle simultaneous row+column clears
5. **No game over detection** - game continues even when no moves possible

**Key Improvements Needed:**
- Fix the `clear_lines()` logic to properly detect and clear complete rows/columns simultaneously
- Add multiple block queue (typically 3 blocks to choose from)
- Implement scoring system
- Add game over detection
- Improve block pickup collision detection

Would you like me to fix these issues and enhance the game?

**Next Ideas:**
1. **Power-Up Blocks** - Add special pieces that clear entire rows, columns, or 3x3 areas when placed
2. **Combo System** - Implement chain reactions with visual effects and bonus points for clearing multiple lines at once

**Ready to level up your game? Pick one and let's build it!**