How to Increase your Monster's Health and Happiness

Happiness:

1) Do puzzles
2) Play games


Health:

1) give it food by buying food at the Gross-ery store

Tip:
Go to your profile at your house and then select your favourite colour. Then go to the Gross-ery Store and buy food that aresimilar to your favourite colour. They work better. But other expensive food of different colours may also work well, but it may waste quite a bit of money.