Best. Flash. Game. Ever.
If you've played any of Super Mario Bros. Crossover for any length of time, you'll come to the same conclusion that I did: Best. Flash. Game. Ever.
The Flash game is a result of Jay Pavlina's desire to make a game, and for his first effort ever at programming something – it's superlative. And now the amazing take on the classic is about to get upgraded with a ninja.
Check out an interview with the game's creator here.