First you need to build a monster academy then from there you can upgrade your monsters.
Note: You can only upgrade all monsters to level 5 max
you have to upgrade it if it wont let you then you have to upgrade your town hall
All you have to do is kill alot of enimies.
You need to upgrade your town until and upgrade the the twig machine and then your capacity will grow also try to have as many twig machines as possible.
backyard monsters hacked
There is no monster bunker on backyard monsters!
If you have a level one monster academy, you will be able to upgrade all of your monsters to level two. But to upgrade your monsters to level three, you must first upgrade your monster academy to level two. Then, once you have upgraded your monsters to level three, you must upgrade your monster academy to level three. I.e, if you have a level two monster academy and your pokeys are upgraded to level three, if you want to upgrade your pokeys to level four, you must upgrade your monster academy to level three.
Backyard Monsters is a game that can be played on Facebook.
Yes there are hacks for backyard monsters but you need to download cheat engine.
Put them in your bunker.
After the newest upgrade of Backyard monsters, you can now use a monster bunker to attack other monsters with your own monsters, using anything other than the D.A.V.E is really just annoying for the person attacking you as they will have to stop in the middle of your yard while being attack by sniper towers ect... loading up your monster bunker with pokies is also a good idea if you have not yet unlocked the D.A.V.E Hope this helps
Try Edgeworld on facebook. It's just like backyard monsters Except that their are no monsters, Its a sci-fi game.
To protect yourself from monsters your not supposed to attack them