£8 eBay job lot | Can they be fixed?

This little lot cost me a whopping £8 off of eBay. Just sold as "faulty" without much explanation.
We have a lovely retro MB Pocket Simon, a PMS(L) Sudoku Challenger and a Mini Arcade game thing.
Let's see if we can get them all working!
Hope you enjoy!
Steve
PS. I'm not an expert in repairs at all. I do this for fun, and it may not be the best or safest way to go about repairing broken stuff. I'm pretty good at melting plastic though. Please don't copy me - I'm an idiot.
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Some of the magic things I use to break stuff;
My soldering iron: UK amzn.to/2Isf360 US amzn.to/3dfq8Xe
My hot air station: UK amzn.to/3kPxaBQ US amzn.to/3xo0SoM
My microscope: UK amzn.to/2VP3msU US amzn.to/3DmDgED
My desoldering gun that goes "moo": UK amzn.to/3HHt73P US amzn.to/3QHJOkb
My multimeter: UK amzn.to/2LjBgnN US amzn.to/3qEiSHy
My blue mat: UK amzn.to/48ZgkI8 US amzn.to/3LcZUkI
Filming equipment;
My camera: UK amzn.to/38IdR7s US amzn.to/3BiwyNg
My 2nd camera: UK amzn.to/3Rfjn6U US amzn.to/3BGOB1i
My microphone: UK amzn.to/3rCriPc US amzn.to/3QJwWtS
VOS's mic: UK amzn.to/3pz2c1L US amzn.to/3Lc7aO1
Links are affiliated where possible to help support the channel. Nice.