MIXED-UP MOTHER GOOSE

MIXED-UP MOTHER GOOSE (Sierra On-line, CD-ROM for PC, $44.95) Kids be nimble, kids be quick, kids navigate, point, and click -- in the course of helping 18 characters recover the lost props they need to undertake their famous rhymed exploits. When players return the items, this clever game rewards them with such uptempo musical delights as a rap rendering of ''Humpty Dumpty'' or a reggae ditty about Little Jack Horner. Add witty, vivid graphics and intelligent inhabitants of ''Mother Goose Land,'' and you've got a game guaranteed to turn a child -- or parent, for that matter -- into a merry old soul indeed. A