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Update 2.2 will be the 12th major update of Geometry Dash with no set release date.
It is possible to either copy a level into Geometry Dash World (You would need to have a GD user account) or use a hacked APK of Geometry Dash SubZero to gain access to the 2.2 version of the level editor, which does not contain all of the features, but gives a preview into what Free Fly, Reverse and Camera will look like in custom levels.
24th June 2016: RobTopreveals plans to add a trigger that will allow players to manipulate the camera angle.
8th February 2017: Viprin, Etzer, and Michigun announced an icon contest in collaboration with RobTop in which the 10 winners of the respective categories of the contest would get their submissions put into Update 2.2.
8th March 2017: RobTop releases the first teaser image of Update 2.2, showcasing a new game mode.
20th July 2017: RobTop replies to AdvyStyle's comment on twitter, showing a new comment system.
22nd July 2017: RobTop comments on the respective daily level with the following:
"Hmm 2.2 info... Well one thing is it will be out pretty quick after 2.11, that's good."
"Secret: In 2.2 I am testing the idea of flymodes without roof or floor, so you have no limits."
23rd July 2017: RobTop comments on the daily level with the following:
"Added some more secrets and secret unlocks. eheheheheh"
"There is a 'Top Artists' list to help people find custom songs."
19th and 20th August 2017: RobTop comments on the daily level with the following:
"@PlatnumGD - I can add a "select All in GroupID" for 2.2"
1st September 2017: RobTop comments on the daily level with the following: "@Ocharius - More options for blocking players, timeouts etc will be added in 2.2 :)”
7th November 2017: RobTop goes on EricVanWilderman's stream and talks about 2.2. He reveals that he may be adding Unlockable Death Sounds and also says Challenge Mode will not yet be featuring Multiplayer capabilities.
21st November 2017: RobTop uploads a video on YouTube about the “Random Trigger”.
29th November 2017: RobTop uploads a video on Youtube showcasing a new desert-like background, camera controls and free flying.
1st December 2017: RobTop uploads another video, showcasing cube direction change.
21st December 2017: RobTop releases "Geometry Dash SubZero" on iOS and Android, revealing the 2.2 triggers and more. Robtop also comments on how the flip trigger and percentage will work in 2.2 in this forum post: http://gdforum.freeforums.net/post/747526
23rd December 2017: A hacked Android version of "Geometry Dash SubZero" that allows users to use the 2.2 level editor is released, revealing a reverse trigger, new editor features, and the ability to use Free Fly mode for all gamemodes. Also, the level copy exploit from GD World now also has 2.2 features.
31st December 2017: RobTop comments on the level "Wire Frame" stating that he will add new tools to make using camera triggers easier.
4th January 2018: RobTop comments on the level "Opalescent" saying that he would add new level editor features to make creating easier, due to the fact that the new camera toggle is hard to control.
2nd February 2018: RobTop comments on the daily level saying that "2.2 is looking good, got nice stuff for everyone :)" and apologizes for being slow. He also confirms that there will be new monsters in 2.2 along with a trigger that stops the player from jumping at any time, also stating that "Challenge Mode > Multiplayer Mode", probably meaning that a Challenge Mode is more likely to come in 2.2 or other future updates than a Multiplayer Mode.
5th February 2018: RobTop again comments on the daily level and gives a small amount of information, saying that "2.2 does not have all 2.2 stuff", suggesting that not all of 2.2's confirmed features have been added yet. He also says that he will probably add a custom art system in the next update after 2.2, also saying that he is 100% planning for 2.3 to be a small update.
6th February 2018: RobTop comments on the daily level for a third time saying that he might add a new level event occurring every 3 days that will only have Insane difficulty levels in a future update.
10th February 2018: RobTop comments on the daily level, Zim by DanZmen, saying "@Robotic24 - [2.2 is] going well. Playing around with code for challenge mode :)"
12th February 2018: RobTop released the fifth teaser which hints the soundtrack for the new level. The teaser depicts a bucket with a Swedish flag in it and the words "I know". On the right, the teaser shows a planet-like symbol along with two other symbols. Based on this, it is assumed that the song is Hinkik - Explorers.
13th February 2018: RobTop comments on the daily level saying that there are numerous features planned for 2.2 that he hasn't mentioned; saying "Multiplayer = Challenge Mode. Don't get any ideas" and that there will "hopefully be an alpha version of challenge mode in 2.2. We will see :)" He also mentions that he is currently programming lots of fun stuff.
14th February 2018: RobTop comments on the daily level saying that he is coding the challenge mode system with chat and thinks it will be fun. He says that challenge mode "can be multiple players, random level, x attempts, lots of settings", also saying that there will be more chests to open in the Treasure Room in 2.2. RobTop also says "@DrFox - if I get challenge mode working it will be huge tbh" and that he will probably remove the Force Smooth Fix option. He also says that Challenge Mode is the same as Multiplayer Mode.
16th February 2018: RobTop again comments on the daily level with info that "Challenge mode coding is going well. Now I have a lobby that friends can join etc. :)" He also says that he has been building a new ban system and that in 2.2 elder mods will be able to comment ban users temporarily for an unspecified amount of time. RobTop also mentions that elder mods can pick a custom comment text color in 2.2 and that he needs to set aside some time to fix the global leaderboards. Hours later RobTop comments on the new daily (Cobalt) saying that multiplayer/challenge mode is going well and that he should have an alpha version ready to be used in 2.2.
18th February, 2018: RobTop goes onto Knobbleboy's stream announcing that the new collaboration system will be delayed due to it being a pain to make.
23rd February 2018: RobTop comments on the daily level saying that he has added a song trigger which can skip to different times in songs while playing levels.
25th February 2018: RobTop appears briefly on the daily level "Cold Fire" saying "Dont worry 2.2 is coming, all going well :)"
5th March 2018: RobTop comments on the daily level saying "you better not look for my new vault in 2.2. gonna hide it gooooood Kappa", meaning that there will be a new, fourth Vault in 2.2 and its entrance will be harder to find.
6th March 2018: RobTop comments on the daily level saying "@GDGeeDee - Challenge mode has a kind of online/offline indicator for players. Thats something :|"
10th March 2018: RobTop appears on the Demon List stream and says he is considering adding an official FPS (Frames Per Second) option to the game, which would help ease any potential drama over the current FPS bypass.
11th March 2018: RobTop comments on the daily level saying that all is good with 2.2 and that he is still working with some stuff for the challenge mode. RobTop also says that he has added extra steps to stop users from faking account names, and also changed the way the user search system works. Finally, he says "Not sure what I am most excited for. All the new stuff will be big for GD tbh".
13th March 2018: RobTop comments on the daily level with a decent amount of info, saying that he is still planning a reward system for challenge mode, and that he is still wondering whether a player will only be able to join games with friends or if the player can join any game - RobTop also says that "Could also make it [challenge mode games] by invitation, so you can invite anyone even if they arent a friend", and that the maximum amount of players in a challenge will probably be 10. He also says "@CircleGMD - New game mode is 100% done" and "There are more chatmods than SirHadoken, but yea more will be added :) Also added some changes :)" RobTop also confirms that the custom art system will probably be in 2.3.
22nd March 2018: RobTop comments on the new daily level saying that he isn't giving any more 2.2 spoilers yet but he is playing with some more ideas. He also says "Working on lots of stuff, today I was drawing icons...".
24th March 2018: RobTop comments on the daily level with: "...2.2 is slow, doing all I can to get it ready :) Sorry to keep everyone waiting :/"
26th March 2018: RobTop comments on the daily level saying "You can use challenge mode in 2.2 as a chatroom if you want", hence confirming a chatroom, and "@MarcoDash - Lots of triggers in 2.2, spicy triggers". He also says that the scale trigger will not be in 2.2 but probably in 2.3. RobTop also reconfirmed the usage of the song/sound trigger with "Sound trigger allows you to skip around in a song. So you can skip boring parts and go to the drop!", also saying "Think you are gonna like the new unlockables in 2.2, lots of things setup :)"
28th March 2018: RobTop comments on the daily level stating: “Nah, you can’t change song with song trigger. Too much lag” and “With the song trigger you can place it where you want, and enter milliseconds to skip the song to.”
7th April 2018: RobTop tweets a link to an unlisted video called: "TimeWarp test" that showcases a new trigger called the "TimeWarp" trigger, which allows you to manipulate the level speed. This trigger is expected to be used for better sync with the level song.
19th April 2018: The purpose of the 2 triggers of the beta editor of Geometry Dash World/SubZero whose purpose was unknown before was revealed by OmegaFalcon.
The first trigger turned out to be a 'no jump' trigger, which stops players from jumping when holding unless they stop holding then hold again. 
The second one was a 'don't fade' trigger, which deactivated the object's fade effect. 
27th May 2018: RobTop comments on the daily level that "2.2 has been slow, but it will be pretty big so atleast thats something :)" and "magic section code is secret :) but it seems to work ok"
9th June 2018: RobTop replies to a user on Twitter, saying that he can “increase the limit” for the maximum amount of your custom objects in a future update. 
13th August 2018: Viprin confirms that a new sneak peek is coming soon.
16th August 2018: Viprin says that the difficulty of building Challenge Mode, the upcoming multiplayer mode, is the primary reason for the 2.2 delay.
14th October 2018: RobTop replies to Guitar's tweet, confirming that he will add a left-handed option for the newly revealed mode. 
27th October 2018: RobTop comments in the daily level chat and explains that he is working hard on 2.2 and that there is new content he has yet to reveal.
7th December 2018: RobTop joins ChrisCredible's Twitch livestream, in which he mentions that, although he is working to release 2.2 before Christmas, such a goal is difficult for him to achieve. Regardless, he agrees to do his best to release it as soon as possible. Some other features he brings up include a revamped scale system, which consists of a scale trigger and the potential option to make an object's size smaller than the current minimum. Additionally, he brings up the possibility of hiring others to help him work on future updates after 2.2. He also explains why the update is taking as long as it is, saying that "it grew too big" and that "some features take way longer than expected". He agrees that updates after 2.2 will most likely be smaller and will take less time. 
Camera manipulation triggers: Offset, Static and Zoom
New, currently finished gamemode (speculated to be called "swingcopter" due to it’s mid-air swinging motion)
Reverse feature for all rings and pads (except for dash rings which may be modified in the future) and triggers
New “No Effect” box for high detail objects e.g. Mirror Portal (used in the SubZero level Nock Em)
New level: Explorers
New triggers including: Song, End, Random, Reverse, TimeWarp, No Jump and Don't Fade
A fourth vault
A multiplayer mode (known as Challenge Mode) with a chatroom
FPS option has been mentioned by RobTop, but will probably not come to fruition
Reworked user search
More chests in the treasure room
Free fly mode for every gamemode with limited units e.g. Ship, Ball, UFO
At least 3 new backgrounds and 1 new ground
Unlockable death sounds
New "platformer" controls
Furthermore to be mentioned
The first 2.2 teaser, showcasing the new game mode
The second teaser hinting at a new soundtrack, possibly ‘Explorers’ by Hinkik.