Phobos

Phobos is a demon level, created by Tygrysek and others. It considered as one of the most hardest mega collaboration ever created in Geometry Dash, and more likely to be near impossible to finish.

Gameplay
Phobos starts as KoBaZz's confusing mini cube part which requires crucial timing, and was filled with fake jump rings and gravity portals, after that, now in Honeyb's part, the background and ground turns into dark, and will enter a wave mode, which is moderately hard. The colored spikes in the Honeyb part will slightly change into black and white, then the cube mode which will last for a second will come and changes into a hard mini wave mode, the route was blocked by a sawblade and requires to go under, then you will see Honeyb's name and enter TechneT's part. An another cube part similar to those of KoBaZz's but was more harder and needs more crucial timing, the design of his part is similar to those of Steam Chamber by Darnoc. After TechNeT's part is GMTSean's part, which will begin as a confusing UFO and requires more crucial timing and jumps. Then the UFO will become a slow ship part, but has a very tight spaces, then transition of Mini to normal will also appear, after that. A mirror portals can be seen, which can confuse the player due to the mirror changes. the speed will become triple then double, and a blue mirror portal and a yellow jump ring can be seen, which Jobet's name will be seen then, Eduard0's part that was a wave mode which is harder due to the sawblades and tight spaces. After that. The gamemode will become a ball mode, which is now iBlade's part. This part is tricky too and requires more timing and jumps. Then a very hard wave mode will be next, and a ship mode too. You can see Palery's name and a Speed changes with a very tight space can be seen. A mini wave mode, with invisible slopes will appear which is seems to be hard. The level's color suddenly changes into green and next, the player's sequence is now a ball mode, entering TerraSmokes' part, his part is very hard because it was filled with unnoticed routes, and tight spaces. After Smokes' part, will become Jo2000's part, which is considered to be one of the hardest parts. The ship mode is very tight and requires to slowly fly. The game mode will become a hard wave mode, and changes back to a slow ship mode that means, the player has entered DreamEater's part. Then a short wave mode will be seen and entering Tygrysek's part, a triple speed dual ship and Iqrar99's part, a really hard dual mode due to a mixed dual of UFO and Ball mode. Skitten's part will appear as a cluster of sawblade and a normal speed ship mode. The part has a gravity portals and yellow jump rings. Then suddenly will become a UFO part. After that, the player will be a cube mode and be send to Kubs0n's part, then the color scheme will be green as well, his part is one of the easiest part in the megacollab. After that, Andromeda's part: A Necropolis-styled level, that is filled with crosses. A cluster of blue jump pad will appear then, a 2.0-themed hard ball mode will be the next part, Caernavron725's name can be seen then, iRazur's named will appear near a Teleportation portal. A short, but hard UFO part, there is a noticed, way can be found, next to WOOGI's name, the gamemode will become a ship, then a short ball mode, then a ship again. A rotating group of sawblades, being rotated by a Mode trigger which needs to be dodged, if not, can be hit by the player. A robot part will seen but last for a second, then back to a triple speed cube. A "Take a Break" text will appear before entering Riqirez's part. Then, when the player reaches the last part. It is a cluster of small invisible spikes and blocks, portals, jump pads, and jump rings can be seen There are crosses made out of glow can be seen. The level will end as a hall of the people who participated in the megacollab, with the sentence: "Congratulations! You have completed one of the hardest megacollab in GD!". Also it says that, it was verified by Tygrysek himself.

Trivia

 * Phobos is considered to be one of the most hardest levels ever to be created in GD, that is because the level has some tight part, mixed duals, and cluster of fake ump pads, jump rings, and portals.
 * Riqirez's part was originally a near-impossible part, until Tygrysek re-verifies the level and nerfed it.
 * This level was originally featured and rated as Demon until suddenly was unrated and also was removed by Tygrysek after being unrated.
 * Each part has their distinctive own colors and designs.