Levels: 1: Between -1 and 1 2: Between -1 and 2 3: Between -2 and 3 4: Between -3 and 3 (with some negative numbers) 5: Between -4 and 4 (with some negative numbers) 6: Between -5 and 5 (with some negative numbers) 7: Between -6 and 6 (with some negative numbers) 8: Between -9 and 9 (with some negative numbers) 9: Between -9 and 12 (with some negative numbers) 10: Between -12 and 12 (with more negative numbers)
