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I am trying to build a mob system where the pistons push the mobs. The screen shot below shows my current design, but I'm thinking there has to be a more space/redstone efficient way to get at this. Or is this as good as it can get?

enter image description here

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what is the green "25" on your screen? – ChargingPun Nov 15 '12 at 14:56
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@ChargingPun Screenshot is from my creative world. the green 25 is the experience level on that world. My kids play a lot on that world and love punching sheep.... – John Nov 15 '12 at 14:58
Ah, I see. I play minecraft on xbox, and we don't have experience... yet. – ChargingPun Nov 15 '12 at 15:13

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You can make your device smaller if you replace the piston with a sticky piston and put it in place of the top torch.

Put a block on it and you are done:

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Let's see, that's almost half the redstone, and volume of device is 4 instead of 9? SWEET! – John Nov 15 '12 at 14:59
john you do need a slimeball for each piston though (not that hard if you have found a slime chunk) – ratchet freak Nov 15 '12 at 15:13
ratchet freak Not a problem for me, I have a slime farm. My biggest issue with my design was the space required. This design is super compact on space usage. Very nice. – John Nov 15 '12 at 17:41
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As ratchet freak said, you can cut the redstone use by adding a block.

Also, by alternating repeaters and single bits of redstone dust, you can cut your redstone usage by 1 per unit on average:

Finally, if you are pushing 3 block tall mobs rather than 2 block tall mobs, you can use an even more efficient system using tripwires shown here:

This increases the iron requirement per cell to 2 but cuts the redstone down to only one.

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