INASA!!! My friend made this game... I'm American, so I don't have experience with a rainy summer day stuck at my grandparents' place in Japan - but I (and I imagine many others) have similar youth experiences of being left at a relative's house, feeling like there was very little to do... this game conjured a lot up for me. I loved the choice of letting you pick 20/40/60 minute play session, I also liked slowly uncovering the moveset. After about 10 minutes you'll have an understanding of the house, so passing time becomes a matter of how you use your moves... you can crouch, sit, jump around, open doors or move stuff. As a kid, once I had a Game Boy it became easier to feel busy (perhaps to a fault), but I remember doing things like trying to 'draw' images on plush carpets my moving the fibers, sliding down staircases over and over, looking at grandparents' travel knick-knacks...