So you toss the blob a tangerine jellybean to turn the blob into a trampoline. Then you bounce off the blob, into the air, and grab the treasure. While the gameplay may sound pretty neat in theory, in practice it can be frustrating and confusing at times. When compared to other NES games, A Boy and His Blob could be considered extremely complicated. If you're going to play the game seriously, it's recommend that you read the manual.
Control is kind of frustrating.
The graphics aren't that great, the sound is nearly non-existant, and the music is pretty horrible. There was a Gameboy version of A Boy and His Blob called The Rescue of Princess Blobette. Gee, there's an original concept. Give it a try, maybe you'll dig it. You'll never look at jellybeans the same way again.