This was my shit. I got really good at it. I remember playing the card game with all the Justice League 10ATK cards, and the gold cards that would have special effects, like Duck Dodgers or MoJoJoJo. I also remember collecting stickers through trades, because I started late in the game and they could only be attained at certain earlier times as promos. My brother found out a way to dupe the trade system (after you accept the trade, you could use Tab on the keyboard to select a button that removed all the items you agreed to trade) which I used to take a huge risk and offer nearly all of my collection for someone's huge collection. It was risky because I had to accept the trade, then wait until he decided to accept and then remove everything at the last second. I actually succeeded. I was a ruthless child.
Let's ignore the random BBS MUDs I stumbled upon and made an ass of myself in when I was younger. Jeebus, I was an idiot back then.
Roughly around the time of Planetarion I remember getting severely addicted to a likely inofficial Mechwarrior Browser game that had basically no graphics. I don't remember much, mostly that the main colour scheme was orange I think? Was amazing though. Wasted so many hours, and then it died. Never got out of beta, IIRC.
I do remember having some fun with Neopets as well, but that was the tail end of my obsession with "low fidelity" online games.
I remember in like the first grade our computer "classes" basically just consisted of them teaching us how to get to the ytv website and play browser games.
The two I remember playing are one where you control flying though the sewer collecting your larvae, and another where you're like a kid sneaking though a spooky house or something?
A quick google search has revealed that these were called "Super Sewer Scramble" and "Freaky Friday"
I was a straight up crook in Habbo hotel, I wore a suit and my character was named Mr.Fox. I had a room with painted walls and wood floors (which you had to pay real money or something to achieve but I forget how I got it.) and would invite strangers to join me in co-ownership to make the best room we could. When they would put their stuff down however (furniture, posters whatever really) I would snatch it all up and ban them. I then took the items and traded them to other players for other items that I wanted. I was a real dirt bag and it's honestly the only time I've played a bad guy in a social internet game setting.. still feel kind of bad about it actually.
I remember one horror point-and-click adventure game I really enjoyed when I was a kid, but I could never track it down again. I'm sure if I ever did find it again I'd probably realize it was a complete shit, but I'd really love to track it down someday.