Because the game is now considered abandonware (where the publisher no longer supports it), several fan-run and game archive sites have preserved copies. According to an IGN article, "you can play the PC game for free...just type 'Tumblebugs 2' into Google and get ten different destinations offering you the same design at zero cost". This remains true today. Here are the most trustworthy destinations from recent results:

The definitive marble-shooter franchise available safely on major digital storefronts like Steam and EA App.