[qwertyuiop924]

I'd reccomend InfiniFactory, actually. It introduces you to the step-test-debug cycle, the three legs of optimization (if you're competing for leaderboards), and the general Zachtronics design, much like SpaceChem would, minus the modular piping. However, it's much friendlier to the beginner than SpaceChem (Zach agressively playtested the learning curve, and had more experience than he did when he was making SC), while still leading up to some painfully difficult puzzles that you will probably never solve, as is the Zachtronics way.

Speaking of which, did you know that Zach himself never beat the last level of SpaceChem?

[bogomipz]

Thank you both for the feedback. I look forward spending some time with all of these then.

[Terr_]

Seconded: Infinifactory is also much more visually intuitive/rewarding.