Subterranean Animism, (romanized Touhou Chireiden, meaning Palace of the Earth Spirits) is the eleventh official game of the Touhou Series. It is like the other games in many respects and is a Bullet Hell shooter.
Subterranean Animism features two playable characters (Reimu and Marisa), each with three weapon types representing a youkai assisting them from above ground. Like Mountain of Faith, collecting power items adds up to four "option" satellites around the character (or eight for the Marisa/Alice combination), which behave differently according to the character and weapon type, and can be sacrificed for a bomb effect. However, unlike Mountain of Faith, each bomb has a different behavior, and some cause special gameplay effects to occur.
The scoring system is once again based on grazing, coupled with collection of two types of items dropped by enemies. Overall, the system resembles some of the core elements of Embodiment of Scarlet Devil fused together with the Tension Bonus System from Shikigami no Shiro series. As such, the player is urged to actively graze at every possible opportunity in order to increase the point item value and not let it drop. Grazing large amounts of bullets in little time is rewarded by the temporary effect of autocollecting all the freefalling items at their maximum value (identically to the POC effect, but without regard to the character's location on the screen), letting the player concentrate entirely on the act of dodging bullets.