Although this is completly different to the NES version, it does sport better graphics and looks, but that's about it. It plays as a pretty generic side scrolling beat em up, feels very repetitive and has pretty much no replay value, once completed.
It's a very, VERY poor man's version of the arcade. There's far better games simmilar to this, including its sequel, which is honestly the much preferred version of the TMNT titles available for the Gameboy.
All four turtles are selectable, April makes a brief appearance, and you fight mostly Foot-Soldiers, and Mousers, and of coarse, bats! What NES game wasn't complete without battling the generic bat? The lazy devs here have done it again now in a gameboy game. No surprises there. Instead of anh recognisable enemy known to the turtles, we get bats! Cowabungholio.
It's very short, not very difficult and as I said, contains no replay value. TMNT II - Back From The Sewers is the only version of the TMNT games for the Gameboy anyone needs for a TMNT GB game, parts 1 and 3 are throw away with too many bats in them.