Checkpoint 9 (Version 0.9.0)

The early version of Phosphor (Checkpoint 9's internal name) can be found in version 0.9.0, but it was unused. It has many differences from the final version.

Differences from Final
Note: This list is not complete and isn't fully descriptive.

Part 1

 * The cubes' glass was colored more like transparent (real) glass.
 * The music is different.
 * There are a few parts of segments which are not present in the final game.

Part 2

 * This room looks completely different at first, though there are may similar things to be found.
 * It features alternatively configured obstacles; the propellers are used in the final game, but rotated to look better.
 * Gears are also used.
 * Octahedral crystals are seen throughout the level, unlike the final.
 * The room is both slower and shorter than the final room.
 * The room does not rotate as rotation was not implemented at this point in development.
 * The music is different.

Part 3 and 4

 * Once again, this room initially looks very different, but has similarities.
 * The room is slower.
 * The music is different.
 * There are octahedral crystals throughout the room.
 * The room is very static compared to the final room. Many of the glass bars don't move at all.
 * There is one Explosive Ball Power Up found in the room.
 * The second part lacks rotation.