Re: Making a more challenging game
I usually use tactical combat but set it to auto. 
Another challenging but SLOW game is allow only colonize same atmosphere and/or type planet as homeworld during game setup. Even if you research another planet-type, you won't be able to colonize it.
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L++, Gd?, $++, Fr-, C---, S*, T?, Sf+++, Tcp, A+, Bb++@, M++, MpB5, MpT, MpD, MpSa, MpM, RV, Pwt, Fqt, Nd-, Rpt, G+, Au, Mmt,S++, Ss+,
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