Goals & Rewards

I'm deeply sorry for not posting the last week or so, I've been busy with my latest game project - of which I'm trying to follow my own advice, which I understand is hard.

Goals, a player needs something to do. All games have to have this, if they don't, they're not games. If you were stuck in Mario with no enemies, no obstacles then it's not a game.
Goals can be anything! Solve a puzzle, dodge bullets, fly forward, anything!
But obviously the more interesting a goal is, the more fun a game is going to be. Kill is not fun. Find and kill a specific target, and we're getting somewhere.

Rewards. Rewards are often quite difficult. Usually the satisfaction of winning is enough, but why not add something else? A highscore table to show off with, an acheivement too? Why not a secret extra level, a special video or anything that only those who work can get it! This gives the player something to strive for.

Well I think this is fairly obvious, but easy to forget.