What does the squares with the spring mean?

Great question! The spring means you pick up and bring to the robots for repair

How can I get additional coding cards?

I would contact the seller or try to create your own. I use these for 3-5yr olds there were enough for them. If this is for children a little older there are other coding games. I have one where they write code with cards to program a mouse and get him through the path to the cheese. It can be quite challenging, even though it's not a long distance.

Model Number	LER2835
Number of Game Players	1
Number of Pieces	50
Batteries Required?	No
Batteries Included	No
Material Type(s)	Polyethylene
Target Gender	Unisex
Manufacturer recommended age	5 years and up
Item model number	LER2835
Product Dimensions	28.65 x 25.81 x 15.75 cm; 1.36 kg
ASIN	B01N7MMCMO

Programming Cards, Let's Go Code Activity Set

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Specifications

Common Questions