Tetris with Cardcaptor Sakura: Eternal Heart is a puzzle game for the PlayStation released exclusively in Japan. It features characters from the Cardcaptor Sakura anime and manga, and comprises of a single-player "Story Mode", in which Sakura has to convert Clow Cards into Sakura Cards by removing all the gems on the screen by clearing lines, and a multi-player Battle Mode which involves more characters from the franchise.
The Story Mode superficially resembles the Puzzle Mode of later Tetris games, with the player can continue removing lines until all the gems are removed. Occasionally, gems don't appear on the screen until the player has placed a number of pieces, which causes the stack of pieces to move up.
The Battle Mode features thirteen characters to select. The first five are available at the offset, with the next six unlocked after completing Story Mode once on any difficulty and the final two have special requirements:
- Sakura Kinomoto
- Syaoran Li
- Tomoyo Daidouji
- Eriol Hiiragizawa
- Spinner Sun
- Ruby Moon
- Toya Kinomoto
- Sakura Kinomoto - Scepter (has different abilities than the original Sakura)
- Sakura Kinomoto - Red Attire (has different abilities than the original Sakura)
- Yukito Tsukishiro (requires a few games in Battle Mode to unlock)
- Meiling Li (requires a special passcode to unlock)