I was a little wary about trying this game out - older games can be both extremely difficult and require a lot of 'guess the verb'.
However the parser here is excellent (though you can't use x for examine) and there are usually several things you can try at any one time.
You play as RJ Wright, a programmer and a plumber, and you have an important project due tomorrow. The game takes place both in Wright's house and on his computer. Using the computer is amazing - DOS is faithfully recreated which is especially fun for those of us who remember using it for years and you also log on to the BBS and exchange messages.
There are many different puzzles, a virus and virtual reality to navigate through and with a great atmosphere and excellent writing there is really only one flaw - the difficulty. The game has a fairly tough time limit and it took me several tries as well as looking at one part of the walkthrough to complete it.
Still it was worth it.
This game seems to only be available for DOS so if anyone has any trouble with this you can follow these instructions:
Download and install DosBox (at dosbox dot com)
Unzip the cosmoserve97 file to your c drive (if you unzip it anywhere else just change the instructions to match)
Go to the Dos Box folder (this will probably be C:\Program Files (x86)\DOSBox-0.74)
Open DOSBox 0.74 Options in notepad and at the end of the file just under [autoexec] type:
MOUNT C C:\COSMOS97
C:
cosmos.bat
Then when you run dos box the game will automatically start.