- example_04_01_declaringvars
- example_04_02_usingvars
- example_04_03_incrementingvar
- example_04_04_manyvars
- example_04_05_systemvars
- example_04_06_morevars
- example_04_07_randompainting
- example_04_08_zoogvars
- exercise_04_03_variables
- exercise_04_05_width_height
- exercise_04_06_zoog_shaking
- exercise_04_4a_variables
- exercise_04_4b_variables
- exercise_04_4c_variables