How did I level my titans????? 

You're right. You need him to win the fire rooms (which he can mostly by himself) and to do damage in healing rooms.

The only way is to play the games that they make offers on and achieve certain condition

@@amanofculture3118 could plz make a video about these games

You just need to click on the Free emerald icon besides the heroes icon then open tap joy or digital turbine and see the offers and the conditions to get the rewards@@morsliabdeldjalil2416