I remember Truco Arbiser. Great program, the Arbisers did a major feat of programming with very limited available hardware and software resources.

I played their PC version, which had CGA graphics, beep tone music, but the game was very well implemented. The computer player AI was somewhat predictable after some time; but again, it would mirror what another truco player would do rather well, so that wasn't much of a problem.

Looking into the executable, it seemed that the PC version was implemented as a BASIC program which was then compiled or perhaps, just obfuscated. This makes it even more amazing, IMHO.