Rebus Series 3

Remember those summers of yore, when you played games instead of studying game theory.

1.  Three strikes and you’re on your way to win?
   
2. Nobody ever got ‘board’ of this game. (Slight Simpsons fundae needed)

   3. This ‘piper’ gets high on shrooms?

   4. (0.693/λ)?

Solutions:

1. Carrom

2. Monopoly

3. Mario

4. Half Life