Grandpa is a survival horror game.
He caught you and locked you in your home.
You have to escape from the house!
You have to solve the puzzles inside the house!
If you are so scared, you will have to close your eyes. When you calm down, the character will open his eyes
He hears everything.
If you find syringes. Stick it in the grandpa and neutralize it. Certainly the effect will pass after a while.
You can hide in wardrobes or desk.
If you drop something, he hears it and comes running.