I grew up playing this series - plus Keen Dreams and Episode 6 - Aliens Ate My Babysitter in the early 90s. My mother and I LOVED this series, and played the living hell out of it, until we beat each and every one of them on HARD mode.

Episode 4 was rough, there on Hard mode... especially in the Well with that stupid bloody Dopefish. Ugh.

And Episode 5, with those Robo Reds and the bloody Shikadi.

And Episode 6, with all the Bloogs and monsters. Ugh.

We learned the hard way in Episode 2... DO NOT 'flip the switches' on the Vorticon ship guns. You do... and you blow up the Earth!

But we beat them all!

granddaddy of the 2d platformer.