drill
Spot the bug
A known problem, a solution that looks right, one wrong line. Tap the line, then see the fix.
10 questions, picked at random from 58
Chalo, a quick round.
- Tap the wrong line, or move with ↑ ↓ and press Enter.
- Enter or → for the next card. Every answer explains itself — wrong ones teach the most.
- No timer. Accuracy first; speed comes on its own.