Checkpoint 9 (Version 0.9.0)

The early version of Phosphor (Checkpoint 9's internal name, found in version 0.9.0 but unused) 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.