suicide?

Unfortunately, it will require a spiky suicide

Use a dead animal to level out the spiked hole

1-3, 1-4, 2-2, 3-3, and 5-2.

I've been told that you can abuse the wagon physics in 5-2 to save a friend, but they said it's almost impossible to pull off, and they were only able to do it by a stroke of extreme luck. It's pretty obvious you're intended to lose a friend there.

A skeleton can be used to cover up the hole so the wagon can pass.

I'm leaving one friend behind on levels 1-4, 2-2, 3-3, and 5-2, but three on 1-3. Does anyone have any idea how to save those last two friends?

Level 5-4 is about timing. Grab the first key right after the large whitish ball lands in the ditch. Grab the second after the brown ball hits the tall wooden block. Then get the last key when the tiny ball falls into the little slot. All that's left is to wait until the two little balls give you a chance to escape and go for the acorn.

I got the about 3/4 of the way there, then committed suicide. My next guy jumped through the key and landed on the dead one, then jumped to the gold acorn.

To solve 1-3 with only one death requires some planning ahead

There's another way of doing it that involves a physics glitch, which is more time consuming. (I didn't realize you could kill yourself at that point)

Get the key, and make sure you die where the next friend can get to it. Have the next friend sit on the first one's corpse. Nudge it over to the left a little bit, and the skeleton will start sliding across to the right. Stay on your morbid raft, moving a little bit to keep yourself from falling into the spikes, and you'll get across eventually.

Move the little block over until you can make out maybe a pixel or two of white between it and the wall. Jump up and start running and jumping against the big one. The vibrations will eventually push the little block over enough. Also, sometimes when you jump at the big block, jumping again at the height of your jump will propel you up and over.

using a dead animal on every square of spikes.

if you repeatedly push on the little block and run away, you'll get it completely out of the way and the big block will be floating. At that point all you have to do is hop up the platforms and brush against the side of the big block, and it should fall.

The "Paradise Meadows" the animals have been after all this time turns out to be a fancy shopping center created by the humans. The animals are practically heartbroken, their last hope of a happy life quashed... seriously, who cracks a smile at that?

the key to doing that one with no fatalities is to jump toward the green key and pull back before you fall in, its somewhat hard to do.

to get the red key you have to first get the green key, climb up top get the blue key then push the ball so that the steps fall

Exactly how do you get the blue key? Green raises the platforms on the right, then I stand on the Red one. Jump as I might, I can't get over the stairs that I need to push.

http://i37.tinypic.com/20zp9ox.png

http://www.youtube.com/watch?v=Zy5VzbBxM_c
http://www.youtube.com/watch?v=Ibl32drjwNw

http://img90.imageshack.us/my.php?image=seppukutiesachievementpby0.jpg

You just have to jump at the right times. After you get the key, hold right and jump two or three times. Then when the second wheel is falling into the hole, jump again.

1-3 (2), 1-4, 2-2, 3-3 - it was more luck than skill for 5-2, though.

Keep running/jumping, eventually you'll get them (I think it's to do with the way the acorns pulsate slightly).

When you lose an animal to getting squished if you don't move after getting the key, it seems as though it always gets past the bump due to momentum from impact. So if you wait until the last moment to jump, the first wheel seems to make it, and from there you just keeping pushing like always.

Jump on a falling rock and jump on to avoid being trapped.
You can get the key and the nuts without dying, if you push the big rock at the top, so it tips over.
You have to spend a life on the spikes.

Jump twice at the back of the stairs. You can actually get on top of them, if you do this, without killing someone

you can kill yourself on the spot by pressing shift

When you first hit the key, jump straight up high into the air before the wagon hits the ground. That'll remove the excess weight allowing the wagon's front wheel to pass over the bump.

Stand just to the left of the middle peg. When the back wheel goes into the hole, do a short jump and immediately press forward. The timing on this is a lot more difficult, but you want to try to jump AS the wheel is entering the hole. If you do it right, your lack of weight on the wagon will let it bounce a little after it hits the hole, and since at this point you're pushing forward, you'll keep it from rocking back.

jump before the wagon hits the ground and stay off while the first wheel rolls over the spikes. Then, push as hard as you can until the second wheel just gets into the hole and jump again. After that start pushing again and you're home free.

jump high and hit the grass block from the right side towards the spikes. might take a few tries but eventually u fit and can then jump ontop and climb to the second grass block. push it so it falls [so u dont need the key]. then jump on the top grass block bc they are now stuck together. once its free. go back up and push the other end so the block swings and now u have ladder to jump to from the block in the lava to the block against the towers with acorns and then to the end! :] u saved an animal yay

1-1: Pretty straightforward.
1-2: If you repeatedly push on the little block and run away, you'll get it completely out of the way and the big block will be floating. At that point all you have to do is hop up the platforms and brush against the side of the big block, and it should fall.
1-3: Maybe you can pre-place a 'stepping stone' for use right-after picking up the key? Grab the green key, take a friend 3/4 of the way on the red path, commit suicide (Shift key), and let your next guy jump through the red key and land on the dead friend. Then jump to the gold acorn. REQUIRES 1 DEATH.
1-4: Pretty straightforward. Grab the blue key, that friend will die. Then hop onto the swinging ball to catch the acorns. REQUIRES 1 DEATH.

2-1: Jump onto the moving "U" dirt platform and drive it to the right. When it falls, jump onto the right arm of the "U", which'll stand above the lava. Jump to the green key, and *immediately* start running to the left back to the "U" to avoid being crushed. It's easy to collect the acorns after that.
2-2: Get the red key, that friend will die (with many attempts, some have been able to save him, but it's not necessary for the badge). Get the green key and *immediately* jump right and out of the pit. Jump onto the rock and collect those 4 acorns (will take quite a few jumps to touch them, but you can do it). Jump onto the rock platform and get it spinning/moving over to the right, to knock down the blue key. Grab the last 4 acorns and finish the level. REQUIRES 1 DEATH.
2-3: Grab the red key; a multitude of rocks will fall down but there's only 2 that will reach you anyway. Jump over each of the 2 when they roll to you. Hop over to the second stepping stone and nudge the last rock into the lava. Use the remaining stepping stones to reach the golden acorn.
2-4: Grab the red key and *immediately* drop to the floor level and stand next to the wall with the green key. When the green key rolls and touches you, *immediately* jump left onto the dirt platforms. Then proceed to the finish area.

3-1: Stand on the step just before the spikes and jump over them to the green key. Jump over the spikes again and climb the green steps to the red platform. When you reach the dirt wall, just keep going left while jumping until you scale it, then grab the blue key. Push the small dirt circle to the left until the giant dirt platform falls and makes a new path to the red key. Go back down, get the red key, and finish the level.
3-2: Jump high and hit the grass block from the right side towards the spikes. This might take a few tries but eventually you'll fit and can jump on top (don't shove the grass block toooo far). Climb to the topmost grass block and push it so the strung grass block falls (now you don't need the key). Then jump on the fallen grass block because it'll stick with the lower one. Once it's free, go back up and push the topmost block so the strung one swings over the lava. Now you have a ladder to jump to from the block in the lava. Proceed across the towers with acorns and then to the finish.
3-3: Get the green key, jump on a falling rock, and jump on to avoid being trapped (this'll probably take a few tries). Grab the two acorns to the left now. You can get the key and acorns over the lava, if you push the big rock at the top, so it tips over. You will have to spend a life on the spikes to make a stepping stone, so drop straight down onto the spike pit. Use your second friend to land on his corpse, jump out of the spikes, take the last 2 acorns, and finish the level. REQUIRES 1 DEATH.
3-4: Pretty straightforward. Grab the red key, run to the green key, wait for the boulder to roll past you, then race to the finish.

4-1: Keep in mind that jumps with a running start will carry you farther. Hop on the first grass block, and jump left to touch the green key (you really don't need the red key). May take a few tries; if the grass block tilts away from straight up-and-down, restart the level. Once you've gotten the green key, hope across the 3 grass blocks towards the end.
4-2: Pretty straightforward, it's just a matter of timing. Fall straight down which'll grab the red and green keys. Wait a split second and walk over to the yellow key, the grass cart should catch the two falling keys (may take a few tries to get this right). When the cart reaches you, touch the blue key. Let the last key *and* the rock fall down, then grab all the cart's keys and proceed to the finish.
4-3: Get the red key and *immediately* jump right and out of the pit. Get the 3 acorns on top, and push the small dirt block all the way to the right. Get the green key, grab the remaining acorns, and finish the level.
4-4: Pretty straightforward. Get the red key, keep walking forward to make the ship move. When you get the blue key, jump off into the golden acorn.

5-1: Get the first red key and all the acorns, then touch the second red key. The answer to getting the green key without fatalities is to jump towards the key and pull back before you fall in; it's somewhat hard to do but not impossible.
5-2: Get the two lower acorns first by jumping over the spike pit. Now about the cart... When you first hit the key, jump straight up high into the air before the wagon hits the ground. That'll remove the excess weight allowing the wagon's front wheel to pass over the bump. Stand just to the left of the middle peg. When the back wheel goes into the hole, do a short jump and immediately press forward. The timing on this is a lot more difficult, but you want to try to jump AS the wheel is entering the hole. If you do it right, your lack of weight on the wagon will let it bounce a little after it hits the hole, and since at this point you're pushing forward, you'll keep it from rocking back.
5-3: Jump across the blocks until you reach the red wall. Commit suicide (Shift key) and have a second friend use the corpse as a step to reach the next floor. Get the remaining acorns. Now jump onto the *very* right edge of the grass platform and run left, taking all the keys and jumping at the end to the purple key. REQUIRES 1 DEATH.
5-4: This level is about timing. Grab the first key *right after* the large whitish ball lands in the ditch. Grab the second after the brown ball hits the tall wooden block. Then get the last key when the tiny ball falls into the little slot. All that's left is to wait until the two little balls give you a chance to escape and go for the acorn.

5-5: This is a tricky level but still not as hard as some earlier ones. The goal is to get the grass platform spinning fast, so jump onto the platform (I suggest landing in the middle, then jumping again to land just-right of center) and as your landing makes it spin, you'll fall down to grab the key. Since it's spinning, jump on it so it "grabs" you as its arm swings past, and keep jumping to stay on top of it, until the right platform is close enough for you to hop on. Then you just fall down the right pit (don't touch the wall, it has spikes) and make your way to the golden acorn.

No need to lose a life: Tip the swinging platform by jumping into its side from the platforms where you start. Keys will fall down and you can catch them by jumping.

After releasing the wagon, jump up to get the SeppuKutie off the wagon as the first wagon wheel goes into the spike trap. The first wheel will get out of the spike pit and your SeppuKutie will land.
The second wheel is the part I haven't figured out and honestly I am not going to spend anymore time on it. I tried jumping or constantly running but neither of those worked- maybe this is where the luck comes in.

You have to jump right after take the red key. Then push the car, and when the second tire pass through the hole, jump again. Push and collect the nuts (dont forget the two on the hole)

But all their friends died for nothing.... Turns out that Paradise Meadow was actually a mall... I feel sorry for them... Waaaaah!