Defender of the Crown for the Amiga was the ultimate in computing technology, back when I was a kid- and now there is an exact Flash version online to relive those glorious days. My friends Jon (aka Jonny Smelter) and Doug and I used to play after school all the time. We each had different jobs - Doug did the raiding, I did the catapulting and Jon did the jousting, which was the hardest by far. We persevered and eventually defended the crown all the way to Crowntown.
Oh yeah and Barbarian and Marble Madness. Best games ever, but I couldn't find Flash versions of them so you just have to take my word for it.