Quick answer: A cardboard egg carton makes a quick treat puzzle. Start with the lid cut off and a few treats in open cups. Once your cat empties it easily, close the lid partway, then stuff cups with paper. Always supervise, use a clean, dry carton and bin it when it gets soggy or torn. Count treats as part of the day's food.
Cats are built to hunt in many small bursts through the day. A food bowl removes all the work. A puzzle brings some of it back, and the egg carton is one of the easiest to make: it is free, sized for paws and easy to adjust.
This guide focuses on levels, so the puzzle stays interesting without becoming frustrating. For more designs, see our DIY cat toys and puzzle feeders hub.
Why Levels Matter
A puzzle that is too hard teaches the cat to give up; one that is too easy is just a slow bowl. Starting easy and adding difficulty only after success keeps the cat interested. Most cats move through the three levels below over one to three weeks, though some stay happily at level two.
International Cat Care on puzzle feeders explains how puzzle feeding can help indoor cats stay active.
Choosing the Carton
Use a plain cardboard carton, not plastic or foam, which can crack into sharp pieces and is easier to chew off in chunks. Pick one that is clean and fully dry, with no egg residue or stains. If an egg has broken inside, recycle the carton rather than wiping it. Remove any labels and stickers.
Level One: Open Cups
- Cut the lid off the carton completely.
- Put one or two treats or pieces of kibble in four or five cups.
- Show the cat by tapping a cup and letting it sniff.
- Let it pick the food out with a paw or mouth.
The goal here is simply for the cat to learn that the carton holds food. Use the cat's normal kibble or a strong-smelling treat for the first few tries.
Level Two: Half-Closed Lid
Once the cat clears level one quickly, keep the lid on and cut a slot about 4 cm wide along the front edge. The cat must hook food out through the slot or nudge the lid up. Put food in more cups, some near the slot and some at the back, so the cat has to work for the last pieces.
Level Three: Stuffed Cups
For a confident cat, put food in the cups and loosely stuff each one with a scrunched ball of plain paper. The cat must pull the paper out to reach the food. Keep the paper loose at first; packed tight, it can be too hard. Use plain, unprinted paper, and pick up the paper balls afterwards.
A Two-Week Progression Plan
| Days | Level | Food in cups | Success sign |
|---|---|---|---|
| 1 to 3 | One | 4 to 5 cups, 1 to 2 pieces each | Empties it in under 2 minutes |
| 4 to 7 | One, more cups | 8 to 10 cups | Works without being shown |
| 8 to 10 | Two | 6 to 8 cups | Uses paw through the slot |
| 11 to 14 | Three | 4 to 6 stuffed cups | Pulls paper out calmly |
If the cat walks away or shows frustration, go back one level for a few days.
Reading Your Cat During a Session
A cat enjoying a puzzle looks focused: ears forward, tail relaxed or gently twitching, paws working steadily. It may pause, look at the carton and try again. That is good problem solving. A frustrated cat behaves differently. It may bat the carton across the floor, bite it hard, meow at you or walk away and refuse to come back.
If you see frustration, help quietly by tipping one or two pieces out, then end the session on a success. Next time, drop back a level. Sessions of five to ten minutes are plenty, and one or two a day suit most cats.
Where and When to Use It
Put the carton on a hard floor or a washable mat, away from the litter box and in a spot where the cat already feels relaxed. Many cats are most interested just before a usual mealtime, when they are hungry but not frantic. Using the puzzle at the same time each day turns it into a small routine the cat looks forward to.
Avoid offering it right after a big meal, since a full cat has little reason to work. In homes where the cat is alone all day, a puzzle at breakfast can give it something to do as you leave, as long as the carton is put away when you get back.
Supervision Rules
Stay in the room while the cat uses the puzzle. Some cats shred cardboard enthusiastically and may swallow pieces. If your cat chews and swallows cardboard rather than just tearing it, stop using the carton and choose a sturdier puzzle. Never add string, ribbon, rubber bands or tape, which are dangerous if swallowed.
VCA Animal Hospitals on foreign bodies in cats explains why string-like objects are a particular risk. Signs such as vomiting, not eating or straining need a vet promptly.
When to Throw It Away
An egg carton is a short-lived toy. Bin it when it is soggy from saliva, torn through, or after a few days of use, whichever comes first. Cardboard holds smells and can grow mould if it stays damp. Keeping a stack of clean cartons means you can replace one without thinking about it.
Counting Treats in the Daily Food
The easiest way to avoid weight gain is to use part of the cat's normal daily kibble in the puzzle rather than extra treats. Measure the day's food in the morning, then take the puzzle portion from it. If you do use treats, keep them small and few, and allow for them in the main meals.
Our foraging feeders for weight management covers this in more detail, and ASPCA cat nutrition tips has general feeding advice.
Wet Food and Egg Cartons
Egg cartons are for dry food only. Wet food soaks cardboard quickly, is hard to clean out and can spoil if left. For wet food, use a lick mat or a shallow dish with ridges instead, and wash it after each use. Wipe up any spilled food straight away, too.
Puzzles for Kittens
Kittens learn quickly and enjoy level one, but their sharp teeth tear cardboard easily. Keep sessions short, supervise closely and stick to open cups. Our zero-waste toys for kittens has other safe ideas.
Puzzles for Older Cats
Senior cats benefit from gentle mental work but may tire or get frustrated quickly. Keep them at level one or two, use soft food pieces if chewing is hard, and place the carton on a non-slip mat at floor level. Our gentle toilet paper roll feeder for seniors is another option.
Two Cats and One Puzzle
Give each cat its own carton in a separate spot. Sharing a puzzle can lead to one cat guarding it, and the shyer cat may stop trying. Feeding them apart also lets you see how much each one eats.
Other Puzzles From Recycling
Once your cat enjoys the egg carton, try a toilet paper roll puzzle or one of the projects in our zero-waste DIY cat toys guide. Rotating two or three puzzles keeps them fresh. International Cat Care on play explains why variety matters.
Egg Carton Puzzle Questions
Are egg cartons safe for cats to play with?
Plain cardboard egg cartons are generally fine with supervision. Use a clean, dry carton with no egg residue, never add string, tape or rubber bands, and stop if your cat swallows pieces of cardboard rather than just tearing it. Bin the carton when it becomes soggy.
How do I make an egg carton puzzle harder?
Move through three levels. Start with the lid off and food in open cups, then keep the lid on with a 4 cm slot, and finally stuff the cups loosely with plain paper. Only move up when the cat clears the current level easily.
Can I put wet food in an egg carton puzzle?
No. Wet food soaks cardboard, is hard to clean and can spoil. Use egg cartons for dry kibble or treats only. For wet food, choose a lick mat or a ridged dish that can be washed after each meal, and pick it up once the cat is done.
Will treat puzzles make my cat gain weight?
Not if you take the puzzle food from the cat's measured daily portion. Weigh or measure the day's kibble in the morning and use part of it in the carton. If you add treats, keep them small and allow for them in the main meals.
How long does an egg carton puzzle last?
Usually a few days at most. Replace it when it is soggy, torn through or has held food for several sessions, since cardboard holds smells and can grow mould when damp. Keeping a few clean cartons ready makes swapping easy.
