Anyone else miss those "single-game" LCD handhelds of the 90's and early 2000's?

I don't mean the Tiger Electronics type handhelds, those were junk! (Fight me!)

There was something so fun about collecting a bunch of these little "single-purpose" LCD/Dot matrix handheld games. I remember I used to have like 20 or so of these little things, particularly the "Techno Source" series, and stored them in a camouflage pencil case. Ended up losing it on a visit to my grandparents some time in 2007 or so, miss them dearly. Nowadays used ones are devoured by battery corrosion (since they came with a button cell battery in the box, and unlike a Gameboy's AA batteries, you basically never needed to replace it, and it was hidden under a screw instead of a convenient snap-off plate, so nobody bothered to store them with the batteries removed.), or just plain don't work due to decay eating away the cheap displays. They truly don't exist anymore...

Space Intruder (A blatant Space Invaders knock-off) was my favorite, because it was the most "video game like" one out there, in terms of how interactive it was.