Castlevania: Order of Ecclesia is a platform-adventure game and the third Nintendo DS installment of the Castlevania franchise.

Castlevania: Order of Ecclesia is a two dimensional action-adventure game, featuring adventure and role-playing elements such as the ability to equip armor and cast spells. A new combat system called the "Glyph System" allows the player's character, Shanoa, to collect icons called "Glyph symbols", which she can acquire by defeating enemies or conquering challenges. These symbols can be equipped to her arms and back, allowing her to perform special powers and skills. There are over 100 different Glyphs the player can wield, such as weapon and magic glyphs. Glyphs use Magic Points (MP) to work, and once the MP gauge is depleted, the player must stop attacking to allow it to recharge. The player can also use a special Glyph Union technique, which calls a more powerful attack based on the glyphs equipped. The Union attacks consume the Heart Points gauge, a feature that was absent in Portrait of Ruin. There are also certain Glyphs which can be used to solve some puzzles.