Unblocked Games 66 is not an official site. The version there may be an older, fan-made web port, not the original mobile clicker. Be aware that third-party game sites can include ads or unexpected content. For the best experience, consider the official Case Clicker app on mobile (if still available) or CS:GO Case Simulator on Steam.
As a web-based game, it runs easily on lower-end devices like Chromebooks or older laptops. Casual Nature: