SAVE23-WITHGM-GSEP15
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After seeing the previous OzBargain post about the game on steam, it looks as though GMG have gotten on the 33% off bandwagon too. They also allow the use of the SAVE23-WITHGM-GSEP15 code for a further 23% off the discounted price.
If you are unsure about the game, it is currently F2P on steam for this weekend.
Standard disclaimer: Game is Early Access beta, so don't go in expecting the world, but from what I can see it is pretty much a prettier version of KF1 :).
Good game. Worth $10US on a Steam sale. The dollar is sh!t at the moment.