That is exactly what you have to find out in Monkey GO Happy 5, one of PencilKids’ point-and-click puzzles. The little monkey is unhappy at the start of every scene, and you are the one who has to cheer him up.
With the mouse. Click on things, find out what they do, and use them in the right place. Some puzzles are riddles, others are small mini-games, and in some scenes tiny monkeys are hiding in the picture. If you get stuck, use the hint button in the top right corner.
The art is cartoonish and nothing is scary, but the logic is good fun for adults too. A quality switch (high, medium, low) is in the corner if the game runs slowly on your computer. Sudoku Classic is a calmer way to keep your brain busy afterward.