The Gecko Zero EFM32 Weather Station Evaluation Board from Silicon Labs is intended to show off the low-energy or energy harvesting capabilities of the EFM32 Zero. The ARM-based board has physical and cap sensitive buttons along with the LCD.
It comes pre-loaded with a demo program, which is the classic Space Invaders.
If you’re interested in more about the board, I wrote a road test of Gecko EFM32 on element 14. (Spoilers: I wasn’t impressed. Not a bad board, but rough development environment.)