If anyone having a hard timr getting the 25K badge, hold Up or W and just concentrate on dodging the spikeball. You'l have a much easier time constantly jumping rather than trying to burn calories by just running on the treadmills
Hope this helps
The best level to earn inventium is the last level on the 2nd planet where you are being chased by a grinder.
Simply keep going right and the grinder will take care of the enemies.
If you are in Parasox mode, this is also the best way to get the "get 20 paradox multiplier" achirvrmrnt
lazyman/ afk guide: Hit the block a few times til there are 50 coins on screen, Collect cons and hire a person and buy the pistol for him, place your character where the coins land,
come back in a couple of hours :P
For the KABOOM Trophy, don't bother with buying grenades, save up for the Grenade Launcher and upgrade it, By wave 49-50, you should be getting enough cash to refill the Grenade Launcher,s ammo, With a fully stocked and upgraded Launcher, the last 10 waves will be a breeze, Also, using the launcher counts towards the KABOOM trophy. + this to keep alive
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 "Relive Your Life"){kind=icon}
 "Top Shot: The Game"){kind=icon}
 "New York Shark"){kind=icon}
 "Treadmillasaurus Rex"){kind=icon}
 "Bullet Time Ninja"){kind=icon}
 "Outpost:Haven"){kind=icon}
 "Versus Umbra"){kind=icon}
 "Creeper World 2: Academy"){kind=icon}
 "Words and Physics"){kind=icon}
 "Storm the House 3"){kind=icon}
 "Coinbox Hero"){kind=icon}
 "Bunny Invasion 2"){kind=icon}
 "DJManiax"){kind=icon}
 "Penguin Overlords"){kind=icon}
 "Bubbles 2"){kind=icon}
You can tag the game with the genre more suitable for you