From publisher blurb:
Summoning Rooms is a set of printable dungeon floorplan compatible with any RPG/Dungeon-Crawl game. Use as a standalone gameboard, or combine with any same-scale tileset.
Contains: 3 small battlemaps depicting summoning rooms and chambers, with arcane symbols and portals.
Uses: Ideal for quick encounters, or as secret rooms in dungeons or castles. Summoning rooms can be used as chambers for ancient rituals, the summoning of demons, mystical ceremonies or teleportation devices.
Also included is a set of 300dpi full size jpgs, for poster printing or VTT.