Laser Gun is definately the best gun to use in Survival to hit on multiple bosses, i can easily survive 20k meters with Flame + Laser (With max weapon drop, u'll probably with Laser all time) But too bad after u get on higher levels, there comes the rocket & tesla whith thou they can auto-target, however for most of the time, minions & crates draw off most of the fire power and it's really annoying not to be able just to stick on with Laser only. Kind of disappointed with the Tesla gun after spending 3 hrs+ to get to Lvl 40. It would be much cooler with the Tesla could chain hit targets.
For the hard badge, just right click -> fast foward and u shall complete the game without even fighting the boss for episode 4. There's glitch for gladiator as well, somehow i join in with 2 Hentchmen and kill off 15 gladiator easily.
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Have you made a character? And, we have been on since 1995...