 If you liked
CLAMP in Wonderland
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 ...then you might like
Kyutai Panic Adventure!
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Both are short crossovers between lot of anime. While Kyutai Panic Adventure is shonen centered (Dragon Ball, One Piece, Astro Boy), CLAMP in Wonderland is simply mashup of lots of anime made by CLAMP (RG Veda, Tsubasa Chronicle, Magic Knight Rayearth...). Both have old style animation.