https://itunes.apple.com/us/app/almost-a-hero/id1116630619?mt=8&ign-mpt=uo%3D8
Requires a Jailbroken device and Filza. I've only test this on an older version, and I've lost my jailbreak since then so I can't test anymore. Also, for the same reason, I can't provide the exact instructions but it should be enough for anyone with basic skills to do.
Head into the application's folder. There is a preference plist file in there. Within the file is a SUPER long text field. I believe it's named "data", "savedata" or something to that effect. Everything to do with your account is in this field in plain english. Skill points, currency, even the remaining time on buffs. Go crazy
Do note though, that it is best to edit the file after closing the app and while in offline mode. Once you're done editing, launch the app and buy something. This force saves the game and commits all your changes.
Note: BACKUP that file! I've managed to go overboard with my changes once and it resets everything, but restoring the file fixed it.
Also, again not sure if it's fixed, but there's a bug which helps with some of the challenges. Buy a buff, quit the challenge and come back in again. The buff timer doesn't reset. Do this as many times as needed and the timers stacks. This helps greatly when using the freeze time buff which means you get practically unlimited time to finish the challenge.
See pics below, on the currency hacked.