Hidden Conditions:
This becomes available after you complete PQ #23. For the hidden conditions to trigger, you have to clear the mission in 10 minutes. First you have to take out SS Gohan (Teen) and Piccolo. Concentrate on taking out Piccolo first since Gohan's pretty sturdy and has a long HP so you'll need to gang up on him. After taking them both out, head to the next area.
In the Wasteland, you have to deal with Super Saiyan Vegeta and Trunks. Out of the two, Trunks is quite dangerous so you'll have to take him out as quickly as you can. His ultimate attacks have good AOE (area-of-effect) range and can considerably damage you as well. After defeating them, there's a chance for a Time Patroller to appear near the gate leading to the next area.
In the destroyed Cell Arena, you'll have to face a full powered Cell and SS Goku. These two are quite the headache so be careful not to get caught in their overpowered Kamehameha.
i was level 39 and it was a pain, but after u finish the mission u can make it again with 2 friends and is quite easily if u dodge the big blasts :D
im 54 and having some trouble but i am able to complete it with 2 companions.
What level are you supposed to be around by now? I'm at level 32 and just can't seem to do this, SS Gohan's the biggest pain of all... :l