My guide on how to get the hard badge(it includes a glitch :D).
1.buy a tack shooter and place it where the two roads meet.
2.press tab until the yellow box is on faster shooting.
3.press enter for around 2.5 seconds and you should have reload speed on hypersonic.your money is on negative,so its not a lot of money,but no money.
4.start game.use road spikes if needed.
5.save up for cannons and place them at the entrance for lead bloons.
6.thats about it.
7.no really thats it.
8.stop looking at me.
9.......................make sure its on hard ok?
10.*runs away*