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The entrance - the fleas will fall from the bottom of this after a short delay at the start of each level. |
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Basic wall - Merely gets in the fleas way - 1 of the 3 blocks you can place yourself. |

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Ramps - Fleas can climb up and down ramps to reach different levels. - These are the other type of block you can place. |

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Balloons & Landing Pad - Will carry 1 flea upwards until it reaches the landing pad. Until it lands it will not affect anything, and will pass in front of obstacles - 1 use only. |
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Spring - When a flea stands on top of a spring it is catapulted upwards until it hits an obstacle, at which point it falls back down to land on the spring again. |
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Spinning Platform - If a flea stands on one of these it spins open, and the flea falls through. |
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Bomb - When hit by a flea the bomb explodes destroying itself, and the 8 surrounding blocks. Any nearby fleas are unharmed. |