There are only 20 playable levels in Orb 2
The code is 51210. But this is the end screen. The last playable level is level 20 (code 19094 and hard to beat).
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There are only 15 levels on Orb. See the related question.
It is not a playable level. Level 20 is impractically difficult but can be beaten.
The Code for Level 20 is 305883
level 20 is max with out the dlc
There are 20 playable levels on Orb 2 and 20 similar levels on Orb 2 TNL.
level 14 is:80369 level 15 is:73108 level 17 is:41205 level 19 is:27883 level 20 is:19094 level 21 is:51210
These are the level codes for ORB 2 (the codes appear the same as those of Orb 2 TNL, which has levels that are different but similar, so it is unclear which they apply to). Level 1 is 00000 Level 2 is 90132 Level 3 is 01833 Level 4 is 45571 Level 5 is 12386 Level 6 is 29245 Level 7 is 33869 Level 8 is 54974 Level 9 is 84378 Level 10: 63157 Level 11: 75080 Level 12: 10131 Level 13: 90042 Level 14: 80369 Level 15: 73108 Level 16: 65617 Level 17: 41205 Level 18: 35626 Level 19: 27883 * Level 20: 19094 Level 21: 51210 *To beat level 19, put your computer on a desk or table and get on your knees on the floor. The walls will appear when you are looking at the screen at that angle.
There is no level 22 on Orb2 or Orb2 TNL. There are Bonus Levels including belts and endless levels. There is no level 22. There is not actually a level 21 -- it is the end screen. There are 20 playable levels and 5 bonus challenge levels on the main menu. (to access, enter the level 21 code, which is 51210)
The last playable level is level 20: 19094 (last level) The passcode for level 21 is 51210, "You Have Won" (unlock all bonus games)