This review is for the crawler. I purchased it thinking it had high reviews but it seems all of the reviews are for the robot, not this accessory pack. This accessory pack is very difficult to put together. I bought this with the hope that it would add a bit more robotics for my class that was already learning coding with ozobot evos. I asked my 6th grade daughter to put it together and she gave up because her fingers were hurting. I put it together myself and I understood why her fingers were hurting. Plus, in every pack there seems to be one piece that just won't connect. The little piece goes flying across the room never to be seen again. I imagined a class full of 4th graders (my intended audience) trying to complete this task and I'm already 75% ready to return it. After I finally completed one (I had to open another bag to replace the piece that went missing), I found it didn't work. No matter how I adjusted the tension screw, the thing never moved. So I built another one, and tried different evo's with it all to no avail. I imagined having this experience with my 4th graders and now I am 150% convinced that I need to return this. I have found Evo's to be inconsistent when using them with the markers, and much more cooperative when coding them with blockly. The crawler takes away all consistency that is gained from using blockly and renders this a frustration factory. Read more