This Meccano 25 Model 4×4 Off-Road Truck set is the Meccano metal construction system that unlocks endless possibilities. In fact, you can build 25 different off-road motorized model configurations (only 1 vehicle can be built at a time). There are only instructions for three of these models included and the other rest of the models can be found on their website. We were thrilled when we saw this set. It looked very challenging and a great set that would appeal to my children. We had previously reviewed their robot MicroNoid Socket which is also a fabulous set.