Over one hundred RGB LEDs, all individually-controllable, and four tactile buttons. It's the ultimate pocket-sized rainbow generator for Raspberry Pi.
Unicorn HAT Mini is a 17x7 matrix of RGB LEDs that can be controlled, both in terms of colour and brightness, to display animations, text, simple images, and more. The four tactile buttons add tonnes of utility to control the colour or brightness of the LEDs, or as controls for simple games, or whatever else you like.
Pimoroni created a Python library for Unicorn HAT Mini that makes it simple to control individual LED's colour and brightness, display images or test, make games, and more. There's some really fun examples of how to use the buttons for games, with Simon Says and a fun little Columns-type game with coloured, falling blocks.
Unicorn HAT Mini uses non-smart RGB LEDs, the same as the Unicorn HAT HD, rather than NeoPixel or DotStar-type addressable LEDs, driven by two LED matrix driver chips (the Holtek HT16D35A).
Because the pixels and the driver chip are different to all other Pimoroni Unicorn boards (Unicorn HAT, Unicorn pHAT, Unicorn HAT HD, Ubercorn), examples and code written for those other boards won't run directly without a few tweaks to the code first.