Number Line Jump — Integers
Score: 0
Streak: 0
Best: 0
0 + 0 = ?
Keyboard: ←/→ to step,
Enter to check, R to reset
Rules refresher: adding a positive moves right; adding a negative
moves left; subtracting a positive moves left; subtracting a negative
flips to adding, so you move right. You can step along the line to feel it, or
then press Check when you're ready.