Checkpoints

Checkpoints are places in the game that allow you to continue after you run out of balls in Smash Hit. They can be used in Classic Mode, Mayhem Mode, and Training Mode. Restarting from checkpoints requires the Premium Version. When a ballcount is higher than the original ballcount of a checkpoint, it is saved, and "checkpoint _ saved" will come up. See the image of Checkpoint 3:

Preceding the checkpoints

 * Blank area
 * Starting Stairs

Checkpoints

 * Introductory stage
 * Checkpoint 1
 * Checkpoint 2
 * Checkpoint 3
 * Checkpoint 4
 * Checkpoint 5
 * Checkpoint 6
 * Checkpoint 7
 * Checkpoint 8
 * Checkpoint 9
 * Checkpoint 10
 * Checkpoint 11
 * 1st endless mode

Repetitions of endless modes

 * 2nd endless mode (20,000-28,000)
 * 3rd endless mode (28,000 and above: due to a glitch, it would have ended at 36,000 for this endless mode)
 * Repeating Checkpoint Glitch begins at 30,000 (or if all rooms of the 3rd endless mode are completed), avoiding any more repetitions.

History
Here is a table of when many checkpoints were added:

Random Rooms Glitch start points

 * Checkpoint 2 stage 3 at Classic and Training Mode
 * Checkpoint 2 stage 1 part 2 at Mayhem