Two shit NES controllers:
The U-Force
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This briefcase was supposed to lay open at a 90 degree angle like a laptop and both plates were sensors that detected hand movements where they intersect. Supposedly programmable, it rarely felt comfortable or useful to anyone who used it. I remember wanted to try it based on magazine ads alone but it was never available in my area, probably as a mercy to me. It also came with a flight stick that jammed into the open hole for realistic flying controls, they probably sucked too.
R.O.B.
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The first in a long like of bizarre Nintendo official inventions that look neat but are shit in practice. For the two games R.O.B. was designed for, you assembled all his shit around him and put the Player 2 controller in its cradle. You'd push the select button on P1 followed by directional controls or A/B to make the screen flash in a way R.O.B.'s eyes could pick up and he'd raise or lower his arms, torso turn left or right, and open or close his grip. So for example, in Gyromite if you wanted to move a blue tube out of your way, you Select-Right-Select-Down-Select-A-Select-Up to pick up a top. Select-Left-Select Left-Select-Left-select-Down to hold the top in the spinner and build up speed. Then Select-Up-Select-Right-Select-Right-Select-Down-Select-B to place the spinning top gently on the blue holder that then pushes the lever down to press the 2nd Player's A button, for about 2 minutes before the top loses speed, wobbles, and falls off the blue platform. This then lets the blue pipes in game move back to where they were originally, which might squash you if you were in a bad spot when this happens.
OR. OR OR OR... you could just hold the A button down with your toe, or a friend.
All kidding aside, Gyromite's actually a pretty good puzzle platformer if you just play with 2 controllers. R.O.B. is just so over the top for what you're doing though it's hilarious. I'd argue that game gets harder using him, because some puzzles stagger pipes in such a way that you have to have pinpoint & fast robot commands to climb the pipes a certain way with how the tops spin for a limited time, and you might be standing in the wrong spot when you're issuing robot commands that you die for that reason alone, or tops falling off the rig, or sending bad commands to R.O.B,, like trying to stack tops or dropping them from heights or banging them into each other.