Not worth any money
The first thing you see when you start the game is one of the characters walking up to the other character's house. Many Atari games don't have cut scenes, so this is the only reason why I didn't give this game a 1.0 out of 10. Then, you see the 2nd character go into a corner and close their eyes. Then this is when the actual game starts. You most likely know what you do next. 1st player hides, and trusts that the 2nd player is closing their eyes, then the 2nd player tries to find the 1st player. The only problem is that the 2nd player can go to every hiding spot in the allowed time. So once the hider is found by the seeker, the 1st and 2nd player swap roles.
So that's Sneak and Peek for the Atari 2600. Unless you're an Atari collector, or you like to laugh at bad games, don't buy this game.