The last playable level is level 20: 19094 (last level)
The passcode for level 21 is 51210, "You Have Won" (unlock all bonus games)
Level 18 is 35626 on ORB 2 and ORB 2 TNL.
65617
21. 51210
There are only 21 levels.
The last level to orb 2 is 51210
51210 is the code for the last level for orb 2 TNL
The code is 51210. But this is the end screen. The last playable level is level 20 (code 19094 and hard to beat).
There are only 20 playable levels in Orb 2
There is no level 23, but to get to level 22 just google Orb 2, click the second result, and complete the game here to unlock level 22.
435345
There is no level 50, but level 21 is 51210.
51210