Kaiba Corp ladder was a ranking system for Joey the Passion, Dartz the Dark Lord and later YGOPRO. It was eventually replaced with the YGOPRO built-in ranking system, which is still in use today on KaibaPro. KC Ladder was initially released as a Windows application, containing a number of features, including:
- Ranked list
- Duel Academy dorms
- Items
- Forum
The Windows application was later replaced with a website, which was supported on all platforms and was briefly used for account registration when YGOPRO was first released.