This is a set of video's of the demo's that can be found here :
howtoconstructdemos.com
Simulating gun recoil effect
Implementing a roller painter
Implementing multiple drag and drop
Trajectory calculation - two methods
Dynamic waypoints
In-air jump
Communicating with an iFrame
Flood fill a drawing canvas
Limit the angle of a turret view
Realistic rope effect
Making an air-hockey game
Mirror effect in water
Rifle scope effect
Portal between layouts
Scrolling and zooming multiple characters
Generate random levels from pre-built scenes
Creating a mini map
Creating a color picker
Prevent overlap while dragging
Raycasting with lasers
Physics puzzle game
Learn to create a floating thumbstick
3D rotation of 2D sprite