Great idea! I've never tried it before but I found this:

redoid - A Node.js package that provides an API to control your IKEA Dioder LED light strip on your Raspberry Pi
https://github.com/ffraenz/redoid

Hi,

If you have overclocked your Raspberry Pi at all, the first thing I'd suggest it removing all overclock settings and seeing how the system runs.

Secondly, I'd check that your power supply is up to the job: Looking after your Raspberry Pi – Part 1: The importance of a quality power supply (PSU)

Whether or not you have overclocking enabled, the following guides will allow you to stress/stability test the cpu, ram, and sd storage.

Part 1: Overclocking the Raspberry Pi
Part 2: Stress testing the CPU with mprime
Part 3: Stress testing the RAM with Memtester
Part 4: Stress testing the SD card storage with the Stability Test Script

Regarding the appearance of the yellow square, overheating is common on the Pi 3, however the single-core nature of the emulators in RetroPie generally means this doesn't become a problem - for more information, please see:
Overclocking the Raspberry Pi 3: Thermal Limits and Optimising for Single vs Multicore Performance

Please note that soak testing is important - I found some stability issues that were uncovered only when running these tests for up to 24 hours (that said, for any serious instability these tests will reveal problems far more quickly)

Thank you @edmaul69

@bfenty if it is activating the unused c buttons try mapping those c buttons to non existing button numbers. (Like 20 and 21)

I am just starting a game. I tried 3 different games but no sound with any of them.....hey its working thanks, that worked

Thank you BuZz! Going to try the scraper today.

This is what RetroLink and Retro-Bit N64 USB adapters do, because they don't adhere to the USB HID standard.

I posted a couple of possible userspace drivers here https://www.reddit.com/r/RetroPie/comments/53bt1d/retrobit_aka_retrolink_usb_adapter_driver/ but nobody has reported trying them out yet.

Alternately, get a different adapter. I have had success with one which looks like this: http://i.imgur.com/cC8iegW.jpg

RetroResolution. I switched to running Linux Mint mainly because Ubuntu kept crashing.

BuZz, I read the posts and figured out that I have to press the A button to run Duke Nukem. BTW I am running Retropie on a VM with Linux Mint.

@axis_d Most people will recommend a Logitech F710 or an 8bitdo model. I think those are a great choice.
I really dont like using an Xbox or PS3 type controller, not least due to the quirks of connection issues they can have.

Use the .078 Mame set.
Google this exact phrase (no quotes): MAME 078 non-merged rom
It is the Please no links to sites that host copyright roms site.
Some kind soul put all the parent pieces into the child ones to make a great set.
(Hopefully this is allowed as I am not directly linking to roms. If it isn't I apologize in advance, and please delete.)

@WadeBrody It means a PC as opposed to a single board computer like a Pi. x86 referring to the 8086 processors introduced by Intel years ago.