Monkey Go Happy Bats
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Tasks are usually simple and short: Put a sunscreen on a vampire's face, join a carnival game to throw some balls at cardboard bats and win prizes, make a dude with fever feel better by soaking his nightcap into a cold water and put it back on his head.
The whole game is a puzzle, but it also contains inside real sliding puzzles and simple algebra tasks. Whatever you do, whether you help magician to cut lady assistant in two, or dress up mr. Death or arrange rats in their boxes, one bat gets released each time, until you get to a final level where you meet a giant spider. At the last stage you need to move the bushes, pick up all the shoes (there are 8 shoes) and put them on spider to enable him to walk away.
Finally, you need to use mouse and click on pedestals until you compose a word 'bats'. Doors get opened, vampire and mr. Death get out of the basement along with all 22 bats. And you're done.