Project Tyrfing (プロジェクトティルフ ィング) is the name of a minigame available in Trails into Reverie. It is made up of three levels of difficulty and centered around the development and testing of the Tyrfing units.
Makarov, as part of his work on the next generation of Panzer Soldats enlists the assistance of Rean Schwarzer, the former pilot of the Divine Knight Valimar to help with field testing. Several members of Class VII also volunteer their assistance and act as opponents, including Crow Armbrust who pilots another variation of Tyrfing.
Project Tyfring is available as a mini-game from the Infinity Corridor and must be unlocked.
project Tyrfing is played in a third-person format, where Rean, piloting the Tyrfing S unit, is given free movement in an enclosed arena.He has additional movement options just as the ability to make short jumps, as well as block attacks. Attacks are performed with a choice of two weapons, a ranged rifle which must be reloaded after 30 rounds, and Rean's tachi. using swings and movement options will deplete Tyrfing's energy. If Tyrfing takes enough damage and the HP reaches zero, the game is over.
Most generic enemies have very few hitpoints and will go down in a few hits. They are all based upon Ouroboros's Archaism units including smaller patrol units which have greater numbers, and larger and stronger units such as Apaches which appear in fewer numbers but are harder to take down. After enough generic enemies have been taken down, a boss character will appear (one of Class VII piloting a Panzer Soldat). These opponents are capable of many special attacks and require careful dodging and well timed attacks to defeat. In the Nord Highlands arena, this includes Fie Claussell piloting a Kestrel and Laura S. Arseid piloting a Spiegel. In Dreknor Fortress, Rean faces Gaius Worzel in a Hector unit and Crow who has his own Tyrfing unit. Once all enemies have been defeated, Rean is victorious.