Hi I 'd like your help on how this game works. First I understood that you have to collect jewels to go to next level. But when does these jewels spam ? Is it totally random ? Maybe it depends on your level, or the number of blocks deleted ? With the steam achievments i know how to unlock characters but I still don't understand how to unlock challenges. I had the spikes and drill unlocked but I don't even know why. Inside the game, when box falling, you just have to shoot them to make your level grow a little. There's nothing more to do with them (something more powerfull) ?