Guilty Gear XX Λ Core does not feature a Story Mode.
- Introduces new a type of special move, Force Breaks, which consumes 25% of the Tension bar when used. Force Breaks use the prior sound effect of Overdrives from the prior games, whereas Overdrives themselves have a new sound effect and startup flash effect.
- New "hit effects" which carry over to other fighting games:
- Ground slide: characters can slide along the ground from a hit while almost flat, allowing them to be picked up off the ground with various OTG-pickup moves with no penalty.
- Wall stick: characters get slammed and stuck to the wall for a brief moment before dropping down, as opposed to how a wallbounce works.
- On block, an extra attack level (6) is added for some moves, distinctively-defined by a metallic clanking sound and normally provides notable blockstun.
- Other new additions also include the "Slashback," a form of parrying with reduced blockstun and negating damage, and throw breaks.
- Much like in XX Slash, characters gain additional new moves, though some changes from the said prior title are either retweaked or removed.
- Λ Core features a major aesthetic change: all voices, including that of the announcer, have been re-recorded (or replaced with previously unused samples), and some characters are voiced by new voice actors.
- Brand new HUD that is a revision of the one from XX Slash.
- The playable characters' artworks are also redone, though the select portraits and in-battle portraits still use the up-close story mode portraits from the prior XX games.
- There is a new opening movie and a redesigned menu.
- Story Mode was removed.
- Two new music tracks, "Launch Out" and "Keep The Flag Flying", were added.
- Most of the blood in the game was removed due to censorship. However some characters like Testament and A.B.A still have blood in some of their attacks.
- Justice and Kliff, deemed illegal by tournament standards, were removed from the roster in the console versions.
- It now features three gameplay modes per character, based on the Guilty Gear, Guilty Gear X, and Λ Core fighting systems.
- The original Japanese version has many bugs that were fixed in the American PlayStation 2 release and future versions.