An extra Battery Cubelet is the right way to go if you have several kids sharing a Cubelets set or have enough blocks that you could build separate robots and see how they interact.
The Bluetooth Hat is a great addition; with it, you can control your robot remotely via Bluetooth Low Energy technology using our Cubelets app for iOS, Android and FireOS smartphones and tablets. You can also use the Bluetooth Hat to program your Cubelets using Cubelets Console through the web.
The Knob Cubelet is a good supplement to your Discovery or Curiosity sets. By spinning the potentiometer of this SENSE Cubelet, you can have more control over the data input in your robot creations.
THINK Cubelets like the Blocker Cubelet or Inverse Cubelet increase the complexity of your robot construction by changing the data communication between the ACTION and SENSE blocks. These colorful Cubelets are a good addition if you want to explore computational thinking and make more elaborate robots.
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