Level up!
A lot of the fun in games is trying to increase your score. Part of good game design is to make the game challenging to play, but not so challenging that the player cannot score or improve.
Most players also get better at a game as they play, so if the game difficulty does not increase, the player will eventually get bored because the player will no longer be challenged.
We will start by simply displaying the score on the screen so that the player can see how well they are doing. Then we will discuss techniques that are used to continually increase the difficulty of the game, thus steadily increasing the challenge.
Displaying the score
We already learned how to display text on the screen when we were creating the credits screen. Now, we will use the same techniques to display the score.
If you recall, we already have a mechanism to keep track of the score. Every sprite has a value property. For pickups, we assign a positive value so that the player gains points for each pickup. For...
