To get hard badge: Start easy, win 25 fights (you get an Achievement award of Mythical sword with power 265; use it). Max mana, rage and finally get {calvary, kong's alien, cristal spear}. This unit counters everything! Send as big waves simultaneously as possible (at least 2-3) and they will kill everything. Start hard (keep your stuff) and max mana, rage and take tornado.
Strategy to get hard badge: Collect first few speed boosts, then fly up using medium fuel bursts until 3/5 fuel is consumed. Start collecting space stars. Optionally, you can use "emergency escape" as relatively fool proof way to keep fast speed to collect the stars. Here is an example: http://www.youtube.com/watch?v=hlpsUSKsF7k
I thought about creating a game like this, but never came around to it.
I'd prefer that 1) low quality tower buttons should be changed (but might be just problem on this computer) 2) not '9' but 'esc' should open menu. And it should contain *restart clean*, *restart initial* (with towers I set up before starting level 1) among others. 3) damage must be visible 4) tower selection would change to location selection (maybe different color) 5) Indication when the next wave will come atm. on last map I am put to wait for a min or few for some reason 6) Some way to deduce how fast monsters are getting stronger. 7) fast forward;
It is probably one of the best 15min games that have hard badge, I just sucked at it. Time 56:08, deaths 395. Gauntlet last level took about 30 min, and my left hand hurts :D
To get hard badge:
1) do walkthrogh
2) redo maps using as few blocks as possible
For me, the hardest part was to find out the plausible limits of levels, that could be reached. I found them to be: {{12,20,15}, {21,16,17}, {40,32,38}, {12,23,22}, {10,13,19}, {17,14,26},{16,12,20}, {31,24,16}, {20,29,16}, {18,30,24}, {15,29,20}, {32,29,29}, {27,20,36}, {33,30,18}, {13,31,20}} = 1005 points.
Hope it helps a little.
I f***ed up 5 times, by trying to be strong or intelligent. After that I tried being pretty male actor, who is laid back egoist. I archived max paying job as I became adult, got (9; 10) wife and had 3 children. 2 first children where pretty much max stat. Lived to 120 years and won the prize. (all upgrades and 50k money at end) - Moral seems to be, pretty face and common sense will take you far beyond where you can get with brute force or intelligent mind.
If you complete the game, you can play levels with "Beyond Corruption", there are 10 ways to play the map, and if you have done them all you get "Level Completed".
You can get the badge by completing the levels.