Even though it says it's not worth it, using more gems seems to increase the pick power by quite alot. So if you farm the low level rocks for gems it's well worth it.
FFS !!! i just completed... 30 levels, took me hours and no badge. i have no screen shot so i can't report it. AND to make it worse it delited my account so i can't do the last level again... unless i do all 30 again -.-
Unlockable units: Hobbits: view instructions and credits. Dwarves: load the game 3 times. Bomberman: lose 3 games. Red dragon: beat level 17. Devil: beat level 18. Angel soldier: max out the reasearch tree for all 3 races. PS: repeat this message to keep this information alive.
Ok, just a tip don't go on the corner of the north river and go down into the river and then walk north 2 the end of the map
Coz u freeze the game and it starts glitching, like i'm a ranger and i was going mage spells and holding sowrds