500x
"500x" refers to the several gimmick canvases personally hosted by Vanilla in 2019.
Each canvas had their own url, that being http://flyingsixtysix.xyz:500x/ with the x replaced by a number.
Every 500x canvas was live at the same time unlike Pxls canvases where only one canvas is live at a time.
Canvases
5001
10000x1
5002
8000x8000
Instant cooldown.
NSFW and hate symbols allowed, bots/autoclickers allowed.
5003
1x1
5004
100x100
Instant cooldown.
NSFW and hate symbols allowed, bots/autoclickers allowed.
5005
100x100
Instant cooldown.
NSFW and hate symbols allowed, bots/autoclickers not allowed.
5006
The palette was only made up of red, yellow, blue, and green colors.
5007
The initial canvas was a picture of a computer lab, and the gimmick was that only the computer screens were placeable.
5008
200x200
One pixel per second, stacked to two.
Sources
The #500x channel in the Pxls Discord server. (The archive role is needed to access the channel, obtain it in #roles)