Whenever you stand on the hint tiles in the chest room, they glow with portal effects. each tile corresponds to a different portal color. so its actually
- Green for being hidden in certain crown vaults
- Purple for the big loop portal after the throne
- blue for the idpd office
- Red for the warp zone heart to heart area
extra super spoilers/exact directions read at own peril below
- Green it is health related. if you enter an area with 1 health it plays the B theme more often. entering a crown vault while the b theme is playing spawns the one you found. this vault has pictures of the games lore on the floor tiles (lore vault). you then gotta carry it to a second vault and put it in the room.
- purple behind throne you got it
- blue is in the idpd captains room you can leave the captains base and keep going with ntte
- red! if you see a red crystal heart, run into it. touch it, dont shoot it. this takes you to the warp zone, where a fake wall (slightly waving back and forth) contains a pet. a second hidden wall behind the hidden pet room contains the red artifact