Don't mind the title...there are more than three heroes
The third game on Quest where you can switch characters...The first in which you can unlock more characters to play as.

Unlock upto 15 new characters
Find 35 secret red gems
Complete 15 trainings
Save 3 planets from destruction and unlock 2 more
Hundreds of rooms and thrice more objects

The Art of Unlocking is possible in Quest as the creator of this games shows you.

Behold Three Heros, a game...no...the first game where you can unlock characters!Save the three planets called Belemtra, Terrarto and Kwaing!Unlock a new planet called Androstar if you get all characters. Finishing the three planets unlock the latest planet...Luimoo!

This game will take a loooong time to finish, since I am working on a game called The Island Of Mysteries(IOM).IOM too is a big game, and you can play the Beta version of IOM right now in the textadventures site!

After Three Heroes comes the sequel, Team Up.