[NES Boy]

There's another review here:
http://jayisgames.com/archives/2012/..._adventure.php

While I am here, I should also tell how to get the secret achievements:

Spoilers!

1. Duck Hunted: During the intro, some ducks will fly around while the camera pans up. Use your mouse to click a duck and get the medal. 2. Headbanger: In the level select, rapidly alternate between "Super Mabobo" and "Contra Abobo" until the medal appears. 3. Bobo Battle: Beat the game, go to the Unlockables menu under "Achievements" and select "Battle Mode". 4. Best Ending Evar: Beat the game and watch the entire ending. 5. Luckdragon: Beat the game, go to the Unlockables menu under "Achievements" and select "Luck Dragon Lunacy". 6. Private Party: In the "Double Drabobo" level, before entering the boss room, approach the rightmost wall and walk up the pipes. 7. Thriller: Haven't found it. 8. Friendly Foes: In the "Urban Chabobo" level, wait during the "Finish Him" screen. Instructions will come up telling you how to perform a Friendship. 9. Another Castle: In one of the rooms with skeletons during the "Zeld Abobo" level, there is a crack in the southward wall. Destroy it and follow the path to find Toad from Super Mario Bros. 10. Kill the Messenger: In the "Zeld Abobo" level, when you reach Mr. Informer (the man who tells you the Old Man's weakness), stab him. 11. Sneaky: In the "Zeld Abobo" level, enter the Old Man's room without killing Aquamentus. 12. No Filming: In the "Pro Wrabobo" level, while you're outside the ring during the battle with the Amazon, attack the cameraman. 13. Bloodsport: In the "Pro Wrabobo" level, while you're in the ring during the battle with the Amazon, attack the referee. 14. Surf's Up: In the "Pro Wrabobo" level, at the beginning of the Balloon Fight sequence, Thrilla Gorilla will surf by. Attack him to get the medal. 15. Jason Lives: Haven't found it. 16. Fire Bad!: Haven't found it. 17. Double Trouble: During the "Contra Abobo" level, while in normal gameplay, press Up, Up, Down, Down, Left, Right, Left, Right. The Two-Player mode should appear. 18. Thanks Doc: In the "Punch Abobo" level, there's a secret health recovery just like in the original Punch-Out!!