I had pretty much run myself dry on toontown (connection kept being dropped on the huge boss fights, made me rage) and was looking for a new game to play. Remembered an ad for roblox and decided to try it out. Found out roblox didn't work on mac so I googled "roblox for mac", and came across blockland.
Got the game and got stuck inside a brick at one point and I remember restarting the game because I didn't know that control+K (or in my case command+K) would kill you.
Second early memory is building a base and a mall on the slopes and keeping my computer on for 3 days until I learned about the escape menu. Was really my first "true" PC gaming game - before then it was all flash games or arrow key games.
This was all back in like, 2008 or 2009. Good times.
