4 is an interesting little game. John W. Wells described it well; it is a puzzle game built around a clever cursor engine. The game kept me amused for a while, is pretty much bug-free, and it looks decent.
However, that is about all the praise that I can give this game. The only thing that kept me playing was curiosity about how the game would end up. There is a story, but it is very vague, and it seemed hastily typed. The gameplay is standard; you win the game by trying every object with every other object. This can get tiresome and even frustrating. Some things just made me wonder; for example, why is there only one thing - a fish - in the spring? Shouldn't there be at least two objects in every scene to justify the cursor engine that is used to select them?
4 is an neat little demonstration of an innovative engine, but it doesn't have much replay value. It is not a complete piece of junk and is certainly worth a look, but it isn't that good as a game.