About MRRSN793's Strategy on hard badge: I got stuck on "Oh ho, so close" level by pausing on the transition, so make sure it isn't paused after level 27 (i think) ot you'll get stuck too...
Wanna make money fast?
1 - Finish all the missions (not the puzzles or defense modes)
2 - Buy the best available shotgun with the best upgrades.
3 - equip the double shot perk.
4 - if you want, test it (you will see that the damage is enormous)
5 - Keep repeating the 4 first elite missions (not including the fat bob one) and you will see that the enemies die after 1 to 3 shots, winning EXP and money like crazy!!!
 "You are a... The Sequel"){kind=icon}
 "Rebuild"){kind=icon}
 "Pwong"){kind=icon}
 "Clarence's Big Chance"){kind=icon}
 "This is the Only Level"){kind=icon}
 "The Gun Game 2"){kind=icon}
 "Vindex Gladiator"){kind=icon}
 "Tetris<45"){kind=icon}
 "Monster Truck Maniac 2"){kind=icon}
 "Solipskier"){kind=icon}