Need to waste some time?
This site www.physicsgames.net has a crapload of games that involve concepts like gravity, projectiles, constructions, “destructions”, etc.

So far, I’ve played Splitter, Superstacker, MagicPen 1 & 2, Top Figures, Insurgo, Demolition City 1 & 2, and 99 Bricks, among others. Of course the site didn’t make all these games, but the companies who do, let webmasters host them on their own site with certain restrictions.