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Water - Fleas can't swim so make sure they stay out of any water. |
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Fans - These blow any fleas in direct line with the fan horizontally until they hit an obstacle, the fan will then hold them here. Fans can be blocked by placing blocks in the way. |
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Spider - Eats fleas for breakfast, lunch and dinner. |
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Teleporter - These always come in pairs, and teleport the fleas between each other. |
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Exit - This is where you've got to get the fleas to. |
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Recessed Wall - Doesn't affect the fleas, but means you can't place blocks in its square. |
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Anti-Gravity - When touched by a flea the gravity is reversed so all the fleas fly upwards. Everything now works upside down, including balloons and springs. Pressing it again turns the gravity back on. |

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Barriers - These yellow walls get in the fleas way, but if a flea presses a blue button, all the barriers and blue buttons disappear. |