This guide contains locations for collectibles (milk, sugar, eggs) and all 16 cakes (1UP) that are hidden or somewhat harder to get.

Note that each 1UP can be collected only once in a level and it will not spawn at all if you've died in that level already.

In this guide I didn't include most weapon (donuts, cupcakes, croissants) locations, the ones that are often found by destroying easily accessible boxes.

There is a secret area at the very beginning, it has 1UP and some goodies. Double jump to access it:


Destroy these boxes to get milk:

Jump, while in the air press down and shoot croissant:


Destroy these boxes and the wall to find 1UP:

Break this box:


You can break the ceiling here. Jump up and go as far to the left as possible. This time you will find two 1UPs above the screen (Found by Aegis2005):


Stand here and punch to break the wall:

This wall has hidden cupcakes in it (Found by Aegis2005):


This wall is breakable and there is 1UP in it (Found by Aegis2005):


Jump over the cake to get to eggs:

Stand here, walk left to get milk:


Destroy only one or two boxes, jump on top, go right to get sugar:


1UP is hidden in the ground between these two bushes (Found by Aegis2005):


To get eggs, go up, then drop down while pressing right:


There is an invisible breakable block that has 1UP in it. It's located where the cake image is in the screenshot:

At the beginning, jump here, then jump up and left to find some cupcakes:


You can get to this 1UP by destroying blocks from the right side:


You can break blocks in this part, no need to jump down a platform:


Right after the previous breakable blocks you will come to this platform, jump up and left to land above the screen and you can find eggs there:


At the boss there is a secret 1UP in the last box:

At the beginning jump on the clouds to get to milk:


When you come to the two enemies throwing exploding cupcakes, kill them without breaking too many boxes. You'll need them to get to sugar:


When you come to this place, go right, the wall is not solid, you'll find some cupcakes:


Just where the previous secret location was, there is a hidden 1UP in the middle block:


Eggs are hidden in this block:


Jump over the cake to get to some goodies and 1UP:

You'll come to a green grass patch. When you destroy it, you'll find milk. It's safe to collect it, the bottom of that pit is solid:


When you come to this place, an enemy will roll in your direction. Punch it to make it go the other direction and after an explosive chain reaction sugar will fall down:


To get this 1UP you need croissants. Shoot while standing with your back against the 1UP:


When you go farther, an enemy will roll in your direction, it will blow up the explosive box and eggs will disappear in the pit. If you have cupcakes, stand about where I stand and throw one- the explosive box should be destroyed without completely destroying the bridge. Or you can use a croissant to kill the enemy before it moves- stand here and shoot a croissant while facing away from the enemy. (If you don't have cupcakes or croissants then this is trickier. Jump from the edge of this platform, keep pressing 'right' all the time. You will get hit by the enemy, then you will collect the eggs, and then you should make your double jump to land on the other side):


Jump over the cake and punch/shoot the moon to get some goodies and 1UP (you'll also unlock the 'One Cup of Milk - Shoot for the Moon!' achievement):

There are cupcakes hidden in this breakable ceiling block:


To get this milk, shoot at it with croissants:


Stand here and throw a donut. Left ceiling block will break and 1UP will fall down. You will have to be somewhat quick to collect it because it will soon fall off to the left from the moving walkway (Found by Aegis2005):


There is sugar hidden in this box. You can shoot it with donuts and it will ride on a moving walkway to the other side (or you can duck and ride the moving walkway, then stand up when you are at the box. You will grab sugar without destroying the box. Unintended, I guess):


There is a hidden 1UP above this platform:


To grab this donut, shoot croissants while standing with your back at it:


There are eggs hidden in one of the boxes. Punch the exploding box and then chase the eggs, while they are carried to the right on a moving walkway. It's not too difficult:


Donuts are hidden on this platform above the screen:

I'll edit this guide if there are more secrets found. If you found something or noticed any mistakes in this guide, please let me know!

I hope this was helpful!

Thanks to the developer for making an excellent game and thank you for reading!

Edit 1: Added three new secrets found by Aegis2005 (Thank you!). Two secrets in 2-1, one in 2-2.

Edit 2: Added two new secrets found by Aegis2005 (Thank you again!) and one that I found. One secret in 1-3, two in 3-3.

Edit 3: Added two new secrets, one in 2-2, one in 3-3. Added easier strategies for collecting eggs in 3-2.

Edit 4: Added two new secrets, one in 1-1, one in 2-2.