This one's been bugging me for a while. It's a handheld game console from the early 2000s, maybe from around 2001-2008. I can't remember exactly what the console looked like but it had a red and black exterior and had buttons on the right side and arrow keys on the left. The game was black and white, pixelated (8 bit or 16 bit) and simple enough for a 10 yr old to play but still pretty complex.
You would create a robotic/monster-like character that is made up of the head, torso, and legs, and you would move your character around this maze-like dungeon and the mission is to find the exit while defeating enemies that look similar to your character. It was quite difficult to my 10-year old self to find the exit because of the dead-ends and locked doors. And once you run into an enemy (much like in the Pokemon games how you have to battle trainer before you pass them), you go into a battle where you take turns. But during the fight, you don't have any control over how the battle will be played out so you just watch each player taking a strike at the other. Before running into the enemies, you would configure your character's head, torso, and legs to have the best defense and attack. And when you won the battle, I think you were given rewards such as better parts for your character. I remember one of the attacks being a lego-like hand shooting out like Inspector Gadget. I can't remember if there were hp or str stats that affected how the battle played out.
When your character moved across the screen, there was a harsh 8-bit beep, and when you successfully hit or defend in a battle, a low 8-bit beep would be emitted. The map of the dungeon was very simple with thick bordered walls, and sliding doors. Some of these doors would be locked until you defeat the boss.
This is pretty much all I remember of the game, and it's killing me not knowing the name of it. I'm not even sure if anyone's ever played it as well. I might as well archive it in my deepest corner of nostalgia. But I would very much appreciate anyone helping me out!