Catherine Classic intended for an adult audience. The game contains erotic content. It also raises adult themes. The plot revolves around Vincent and his relationships with girls. The 32-year-old guy works during the day, drinks with friends at the bar in the evenings, and has nightmares at night. The man has been dating Katerina for a long time and plans to marry her. But one day, while drunk, he met a girl with a similar name (Katrina) and woke up in her bed. After this, the hero faced a painful choice, since he likes both girls. Against the backdrop of his story, a parallel storyline develops, where male representatives die in their dreams and then die in reality. The non-linear narrative has different endings and sudden turns.

The release contains an improved version of the game, called Catherine Classic. In the re-release, the developers removed the frame rate limit. They also added the ability to customize controls (keyboards and gamepads are supported). In addition, the creators introduced 4K support and allowed the choice of Japanese voice acting.

The project can be classified as an adventure game and platformer. There are also horror elements. The gameplay is divided into 3 parts. Each has its own name. “Drama” is a dating simulator where you need to maintain relationships with both ladies. “The Lost Sheep” is a visual novel. In it, the protagonist chats with various characters in a bar. And “Nightmare” offers dynamic gameplay. The hero is transported to his disturbing dreams, where he meets acquaintances from the real world. They all have to fight for their lives and climb to the top of the tower. An IT guy with a midlife crisis is forced to solve puzzles, run away from nightmarish creatures, avoid traps, quickly move boxes and quickly climb them. There are also atypical boss encounters.