Page 169 - Scratch Programming Playground

X X Uses a variable to track when a cheat mode is turned on
or off

X X Lets the player control the direction of the snake with the
keyboard but not the speed

X X has no end goal; the player continues playing as long as
possible

The Snaaaaaake game’s keyboard controls are similar to
those of the Maze Runner game in Chapter 3. The player has
a top-down view and moves up, down, left, and right. however,
the Snaaaaaake game is different because the player’s charac-
ter is always moving. The player can control only the direction.
You can use this style of movement in fast-paced games of your
own design.
In Chapter 7, you’ll learn how to use the mouse in your pro-
grams by creating a clone of the Fruit Ninja game. Then your
programs will be able to use a keyboard, a mouse, or both!

Review Questions

Try to answer the following practice questions to test what
you’ve learned. You probably won’t know all the answers off
the top of your head, but you can explore the Scratch editor to
figure out the answers. (The answers are also online at http://
www.nostarch.com/scratchplayground/.)

1. What is the difference between when key pressed blocks
and if key pressed? then blocks?
2. What does the go to x: pick random -220 to 220 y: pick
random -160 to 160 block do?
3. What is the difference between the glide block and the go
to block?
4. Why do you need to draw the snake head facing to the
right?
5. Why does the costume center of the Head sprite need to be
set at the center?

Snaaaaaake! 143