Prism 4 is a Platinum-tier qualifier tournament for the TETR.IO World Championships hosted by Hummingbird Nest.

From the announcement post, detailing the bracket splitting process:
"This is a standard TETR.IO open tournament, but with a twist! Instead of one big bracket, players are divided into four brackets based on seed: Pink, Orange, Yellow, and Green. The brackets will be split evenly, except that Pink bracket (the highest bracket) must have a minimum of 64 players."

"If you are currently U rank or unranked but within the U rank TR range, you are allowed to fill out this form [linked in original message] to guarantee yourself a spot in the Pink bracket (as long as you check in, of course). Higher ranks are pretty much already guaranteed to get a spot in the Pink bracket, so no need to fill out the form if you are X or X+."

This market will resolve to the unrounded TR of the lowest-ranked player in the Pink bracket before Pink bracket guarantee forms are processed, as reported by Hummingbird Nest staff (who are running a cutoff prediction game themselves).

This market will close the day before check-ins for the tournament begin.

The current TR range of U rank, as of posting, is 20328.48 to 22597.99.