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 iimage:

Preceding the checkpoints

 * 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
and so on... (every 8000 distance is one endless mode, beginning with 1st endless mode at 12,000)
 * 2nd endless mode
 * 3rd endless mode
 * 4th endless mode
 * 5th endless mode
 * 6th endless mode (unreachable so far)

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