The series is famous for its "Turbo Tunnel" levels. In the 2020 version, you can toggle "Invincibility" and "Crawl" modes if the difficulty spike is too high.
You can download the full version through the Microsoft Store or Steam. battletoads-download-pc-game-full-version
When searching for "Battletoads download PC game full version," be cautious of third-party "repack" sites or "free" executable (.exe) files. The series is famous for its "Turbo Tunnel" levels
Stick to verified storefronts (Steam, Microsoft, GOG). battletoads-download-pc-game-full-version
This is the most stable official way to play the original Battletoads and Battletoads Arcade on a modern PC.