Play As Cyrax, An Easier Way:

You would have to have at least 462 Ruby Koins and open Krypt PD (to get 1056 Platinum Koins) and get the rest of 3003 needed to open CN for Cyrax. You can get extra Platinum Koins in the following Krypts: FV (83 Platinum Koins needed for 243 platinum Koins); PK (157 Platinum Koins needed for 475 Platinum Koins); WS (44 Onyx Koins needed for 165 Platinum Koins); and NG (63 Sapphire Koins needed for 252 Platinum Koins).