VIP games are something that are a bit too large to elaborate in retrospring but to keep it short they are created by very active community in 2(5)ch
VIP creates a lot of stuff, web manga, web novels (some pretty famous), eroge, games..., it's a culture on its own
Among these my interest right now is mostly in VIPRPG, the Moshimo series to be precise since there are other community among VIPRPG like Monarpg, google it you probably already saw some of their games and iconic ASCII characters

Now the Moshimo series is a shared universe created by VIP using the generic characters found in rpg maker, it started with a simple 2 minutes game created by an anon named "If the hero was the strongest" about the protagonist of rpg maker 2000 Alex going to defeat the Maou, Alex is seemingly invincible and effortlessly manage to do so.
It's incredibly dumb and honestly not very funny but somehow it caught on and spanned an entire shared universe made of hundreds of characters and thousand of games, some being 10 seconds long and other 100 hours long
As you can see it's really not something I can talk about here.

I'll try to write something more elaborated on the subject soon