Sim Park 
PC 

Windows 3.1 also work for Windows 98. Click on the screen and type. You cannot 
  see your typing, but it works anyway. ..


Enter during play:


beauregard - all the people in your park turn blue


catsndogs - 200 random things are added to your park


hialiens - cause an alien message to appear


paveme - turns plant like into packed earth tiles


rizme - makes Rizzo appear on demand


sdi - gets rid of alien messages


warbucks - gives maximum amout of money



 
Thanks to Revolution readers Evan and Sindy!