I am already working on game, but I got another idea. Basically a point and click adventure, but the player can't click directly on the items. The main character would turn to the screen and ask "Do you see X somewhere?" (similarly to Dora the Explorer). The player would need to shout "X is on your left!" or similar. In reality it wouldn't have a voice recognition, it would only check the loudness. If the player isn't enough loud, the main character would say "I can't hear you!", otherwise it would point to another location and ask "Here?" and the player is expected to shout "No, there!". The player would need to repeat 2 or 3 times, until he finally finds the item and can move on.