At first there were breadboards, then there were prototypes. We manufactured mistakes and learnt from them, now we have the RetroFlat V1.2
This small key chain has allowed our test group to trial games on a four button and LED configuration. It has proven to be very successful by identifying programmed games that were less entertaining and inspiring replacements. Additionally it has been a prototype for testing hardware and gaining feedback.
If you are looking for a very small device that could be shaped with the outline of your logo, this is it.
Although there were more variations in between, all inventions start out as rough prototypes before they get to production.