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.

Zone 1

 * The cubes' glass was colored more like transparent (real) glass.
 * The music is calming and nice to hear. It is shared with checkpoint 5 stage 3.
 * There are a few parts of segments which are not present in the final game. For example, there's a 3D star in a cube at the end of zone 1.
 * Nested cube frames spin in opposite directions instead of spinning together. The small cube is also smaller and floats in the air, not anchored to a metal cube.

Zone 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 and five-bladed fan propellers.
 * Gears are also used, unlike now, in which they've been replaced with 5-bladed fan propellers.
 * Octahedral crystals are seen throughout the level, unlike the final.
 * Theis 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 and is shared with checkpoint 5 stage 4.

Zone 3
Once again, this room initially looks very different, but has similarities.
 * The room is slower.
 * The music is different and is shared with checkpoint 3 stage 2.
 * 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 used to be one Explosive Ball Power Up found in the room.
 * The second part lacks rotation.
 * Forks didn't exist back then.