From the introduction:
Blyss is a generic roleplaying system to suit any genre and setting. The Basic Rules presents the very core of the Blyss system, a flexible and easily adaptable set of rules and mechanics that can meet the requirements of any game!
The Basic Rules present the core system and reference an (apparently unavailable) Core Rules, varying by the absence of "Option and Variant Sidebars and Appendices". These rules cover character creation, rules and mechanics, equipment, and several tables. Play easily is possible with this product.