Th three tasks below will not take you long but do give you an opportunity to experiment and become comfortable with the Blender interface. They are simple objects to create. In the challenge you will need to be precise and think about all the angles to ensure that the stairs are all connected and would function as stairs - None want to play a computer game where the stairs are wobbly!
Tools used
Objects - Cube and Cylinder
Tools
Scale
Rotate
Move
Duplicate