By Jim Sager, james_sager3@yahoo.com.
You can find the code the modify the size of the block in the following line:
csMatrix3 m; m.Identity (); m *= 5.;
change m*=5.; to m*=.5; Compile and run. Now change the same line to m*=.2; Compile and run once more. You can see that you can change the sprite's scale by changing this value.