1 touch wall - If a flea hits this from the side the flea is turned round, but the wall then crumbles away.
Bridge - These collapse as the fleas run across so that only 1 flea gets over, and the others fall down behind.
Green Button - Causes all the recessed walls to slide out, and become normal wall blocks. Warning! Fleas standing in the way are crushed and die.
Spikes - Skewer fleas, so avoid them.

Other Controls
As well as the blocks you can place on the screen you will see 3 buttons marked 'pause', 'restart' and 'quit' The pause button does exactly that giving you time to think out the puzzles. Whilst the game is paused you can't place blocks on the screen. Press it again to resume play. The restart button is for when you make a fatal mistake and need to start the level again. The quit button takes you back to the title screen, where you can enter passwords to go back to earlier levels, or start again from scratch.

To the left of the screen you will see some important text. This tells you the current level password, write it down so you don't forget it. You can then use it any time to continue play at the start of this level, by pressing -continue game- on the title screen, and then typing the password in. You will also see indicators, showing how many fleas are on the level, and how many you have to save to progress to the next.

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