It's due to a bug where a dispenser will fire whenever it receives a redstone update from up to 2 blocks away. When it receives constant power, the pulsing of a stronger current causes it to fire once on the rising and once on the falling edges. When it doesn't receive that power, it only gets powered during the rising edge, when the pressure plate activates it.
Worked for me. It's due to the other pistons not closing fast enough for the redstone to update the rail piston with space for it to fire. I drew out a flat diagram for you to follow. The repeaters, from top going clockwise, are 3, 4, and 1. There is also a solid block above the off redstone torch, but I removed it to show the torch. Obviously, you can just make this underground and have the detector rails input to the same line. The input is the redstone torch that's on.
The way in the video is probably not the more advanced and hidden method that uses a BUD. Most likely, it just powers wire above the block on top of the torch. As simple as it gets.
Took a look, and I was 100% correct. You didn't apply an ABBA switch. Here's the circuit fix. Just needs 1 repeater and 1 redstone dust. You should've took my advice with my first post.
Here's one. The input is obviously the lever. You can just have it input from the right side. The left most repeater is necessary to prevent glitching.
I think you're forgetting the power-ups that zombies drop, like "MAX AMMO" or DOUBLE POINTS". Double points might be hard because you'll have to find a way to use redstone to make more zombie flesh drop.
Yes, but they do drop tools and armor, which I think is good enough to substitute it.
That's because the sand becomes an entity while moving, so it's possible for you to glitch through it. In singleplayer, your own computer is loading the level and can compensate for the lag, but on multiplayer, you must wait for the server to ping back, which causes you to glitching through the sand. It's most likely just lag, not much you can do.
There could be multitudes upon multitudes of possibilities of what's wrong. I'll just list a couple:
1. Hashset glitches and errors
2. Repeater skipping glitch
3. Computer lag
4. Lag spike of death from saving causing lag
5. Redstone
6. Sheer randomality and unpredictability
Well, you could have a 2 block high tree that can extend out of the ground and pulled back, but that's a little impractical. Otherwise, your only choice in a sand + gravel tree that somehow elevates the branches/leaves part of the sand/gravel.
It entirely possible, provided you have alot of time to build it, a very very good PC and you don't care how fast it is.
Well, if you really did have a super computer and didn't care for speed, you technically could hard-code the entire game into ROM memory and have it pull up a new image for each situation of input. Of course, you'd get like 1 frame every minute, but still, it'd work.
Uhm... I don't think you can move cobwebs with pistons, so that part of your plan probably isn't possibly. Also, you'd have to somehow combine the minecarts together into 1 coherent, specifically shaped piece. There might be a way though.
Uhm... I wrote down a list of all the detectable blocks/items possible somewhere... I'll see if I can find it. But I know you can use things like normal pistons, sticky pistons, bonemeal, minecarts, etc.
EDIT:
Aha! I found that list:
Redstone
Redstone Torches
Repeaters
Button
Lever
Normal Pistons
Sticky Pistons
Coal/Charcoal
Minecarts (Any minecart)
Minecart Rails
Powered Minecart Rails
Detector Minecart Rails
Arrows
Eggs (Any spawn egg, too, I suppose)
Fire Charges
Lava
Water
Dragon Eggs
Eyes of Ender
Sand/Gravel
Pumpkins
Melon/Pumpkin Seeds (Although this could potentially take forever)
Bones
Bone Meal
Cobwebs
Ladders (This would be insanely difficult to make a system for, but it's possible)
A Light Source (Could be done with grass detector, but can be any light source, thus the flaw)
Cactus
Sugar Cane
Wheat
Fish
Bed (Fact that it updates 2 blocks instead of 1)
Ice
The best ones for your situation would probably be the dragon eggs and ice. Unless you're using the snapshot, in which ice will be more easily obtained.
1
0
0
0
0
0
0
0
Yes, but they do drop tools and armor, which I think is good enough to substitute it.
0
0
1. Hashset glitches and errors
2. Repeater skipping glitch
3. Computer lag
4. Lag spike of death from saving causing lag
5. Redstone
6. Sheer randomality and unpredictability
0
0
Well, if you really did have a super computer and didn't care for speed, you technically could hard-code the entire game into ROM memory and have it pull up a new image for each situation of input. Of course, you'd get like 1 frame every minute, but still, it'd work.
0
0
0
EDIT:
Aha! I found that list:
Redstone
Redstone Torches
Repeaters
Button
Lever
Normal Pistons
Sticky Pistons
Coal/Charcoal
Minecarts (Any minecart)
Minecart Rails
Powered Minecart Rails
Detector Minecart Rails
Arrows
Eggs (Any spawn egg, too, I suppose)
Fire Charges
Lava
Water
Dragon Eggs
Eyes of Ender
Sand/Gravel
Pumpkins
Melon/Pumpkin Seeds (Although this could potentially take forever)
Bones
Bone Meal
Cobwebs
Ladders (This would be insanely difficult to make a system for, but it's possible)
A Light Source (Could be done with grass detector, but can be any light source, thus the flaw)
Cactus
Sugar Cane
Wheat
Fish
Bed (Fact that it updates 2 blocks instead of 1)
Ice
The best ones for your situation would probably be the dragon eggs and ice. Unless you're using the snapshot, in which ice will be more easily obtained.