If you play Defender, every kill will count as a headshot. You can prestige at lvl 50, and your progress will be sped up significantly by investing in the XP skill and purchasing the Greed mod for your weapon once it reaches 500 headshot kills.
This is an excellent game. Constantly having to strategize how to use the landscape, where to defend, and when to attack/back off is extremely engaging, and setting a successful trap is especially gratifying. I also love how the Undo button allows you to play around with tactics endlessly, and the Rewind button takes away a lot of the frustration that comes with unpredictability. Easy 5/5.
@iBeTHeReaLToBi, jevonab: There are no "sides". The playing area is in the middle, and the CPUs have four discard piles and one goal pile just like you.
@nono, Wariat, Dan: Given that every White Dragon mission in Career mode is a free chance to try Premium, there are simply no pay-to-win badges on this game.
I very much like that every room is basically a self-contained puzzle best solved through clever use of scrolls and a hero's unique abilities. The sound design is also excellent.
I have all the badges already, and I owe everything to the time travel glitch. If you set your computer clock to a future date while the game is still open, the game will simply calculate how much you would have gained by then and adjust the numbers accordingly (this bypasses the offline limit of a week). Even skipping ahead several years only takes a moment to register, so it's easy to jump to the future and back whenever required. To speed this process up even more, it would be wise to spend the free diamonds the game gives you on a x64 multiplier first, and a x8 multiplier later (the higher your reset boost, the more effective these are). Also, I can definitely recommend using an auto clicker during the later stages.
Also, the unnatural number of badges on this game made me long even more for the Kongregate of yore. Greg would probably have done something along the following lines: an easy badge for 5 kills, a medium badge for reaching rank 3, another medium badge (with 5 tickable boxes) for achieving at least one assist, one ricochet kill, one ram kill, one boost kill and one rear armor kill (across all games), and a hard badge for winning 15 matches. Ah, the good old days...
A tip for the impossible badge: given that the bots in this game are far easier to kill than the average player, it's a good idea to create your own games (click "Battle", "Game List", "Create Game" (if you can't find that last button, briefly interrupt your internet connection before clicking on Game List to ensure no other games appear)) with "Disable Bots" unchecked. Tank Game and Free for All are both great ways to consistently destroy 15+ tanks in a few minutes. All told you'll obviously be busy for a while, but in the absence of a matchmaking system it's still faster than scraping kills against players who've simply had far more practice. (However, do keep in mind that gaining experience to earn higher ranks can only be done against other players, so it's best to reach rank 12 for those badges before finishing the impossible badge (and any others) with bot kills.)
This game can softlock you by deleting Cough's head from your inventory once he tricks you. You can from that point onwards no longer take the head out of your pocket, meaning that the clues it is supposed to give you (but which you possibly hadn't yet found before being tricked) can no longer be obtained and you can never reach the correct ending.
In the second defence mission I am apparently supposed to protect the miner in order to share in the profit by spending the minerals that are needed for us to make a profit in the first place. Not such a great business model.
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 "Spite and Malice")
 "Dungeoneers")
 "Crush Crush")
 "STUG")
 "Tauriel Teaches Typing")
 "Love")
 "Dinogen Arena")
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 "MAD: Mutually Assured Destruction")
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Does that happen once you get the bad ending and then load the game? Please PM me so I can fix this bug