You have to play and feed your monster daily, this will increase the mood!
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Giving your monster attention, taking it shopping, playing with it, decorating its room and feeding it will help to change his/her mood.
You need to visit the monsters room and then, to the left above mood, you'll see a button which says view profile.
play the puzzley and bye new things
You will find the mood of your monster displayed in the bar of the left the screen. A face will represent whether your monster is happy, sad etc.
you can to make it happier: make it dance by pressing at the sky or giving them coconut or fish to make it sad: kill it such as flick it or drown it