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[Doubler]

that.. thing in the water![/b]

Messie! :P

I'm in dubio about whether I prefer Keen 3 or 4. Keen 3 was fun, strangely real, and very hard at times (in all respects the culmination of the first trilogy), but Keen 4 had some very interesting level designs and some vastly improved controls. Keen 6 was nice too, but not really that much of an improvement.
Keen 1 and 2 I can regard equally. They're different, it evolves from 1 to 2, but it hasn't reached it's peak yet.

I've been playing through the games again for the last few weeks, by the way