I loved "Future Wars" as a kid, now no one will play it
I found the hole straight away, since I am awesome like that and went on to finish the game. Which was very imaginative as far as I remember. but after this I don't dare and try it again
Another cool one in that era was Chrono-Quest, a text adventure with pictures, where you find a time machine in the victorian age. The game crashed for me halfway however, so I was never able to finish it.
Then again, DOTT gets the praise it deserves here, so I am cool...