Surprisingly, there aren't very many Hamsterball custom levels at this point! I still decided to compile the best ones into a video, and there's a couple great ones here! The last level shown is actually a Marble Race level that I converted to the Hamsterball level format using the built-in exporter! Making a level in Marble Race and exporting it is by far the easiest way you can make a custom level! If you want to buy Marble Race, here is the link: https://store.steampowered.com/app/851640/Marble_Race
