“Doulo Continent: Reversal of Time and Space” is a high-value Doulo card RPG with zero krypton, a full-card zero-krypton collection adapted from the “Doulo Continent” novel and animation. We implement the concept of “full card zero krypton collection” to break down the krypton card withdrawal barrier, so that every player can easily enjoy the ultimate thrill of collecting a full set of cards! We promote “reducing the burden on the liver”, optimizing mechanisms, reducing repetitive labor, and making games easy. We use a unique dual-form card design, which not only injects more strategic elements into the battle, but also pushes the diversity of the game to a new level, satisfying players' endless desire to explore the game.