The Shiritori reference article from the English Wikipedia on 24-Apr-2004
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Shiritori

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Shiritori is a Japanese word game in which the players are required to say a word which begins with the final kana of the previous word. No distinction is made between hiragana and katakana.

Example: sakura -> rajio -> onigiri -> risu -> sumou -> udon

The word udon loses the game, as it ends with a syllabic n. (Japanese words may not begin with a syllabic "n".)

Usually, only nouns are permitted.

In some variants, dakuten and handakuten (see Hiragana) are ignored. Thus furo can follow suupu.