Designed by Clemens Valens at Elektor.LABS, the AVR Playground – a playful reference to the Arduino forum known as the Arduino Playground – is a hybrid of an Arduino Uno and a traditional micro-controller development board. Intended for ‘doing Arduino’ without bad connections and loose wires (although it doesn’t disallow it), it provides an easy way to start learning the microcontroller without having to solder or add other components. 
It can roughly be divided into four zones with the following functions
  1. extension connectors, USB-to-serial converter and power supply; 
  2. user interface peripherals like a buzzer, rotary controls and a display; 
  3. configuration switches; 
  4. pushbuttons and LEDs. 
The AVR Playground also features a mikroBus expansion slot.