These Knuckles LEGO sets are made of plastic. Product details list "Battery: No Battery Used," so they do not require batteries.
Yes. The sets reference the LEGO Builder app, which lets you view models in 3D (zoom and rotate), save sets, and track your building progress.
Piece counts across the available Knuckles building sets range from 276 up to 378 pieces.
The sets include buildable mechs, shrine-style playsets, racing vehicles (race car and monster truck), and battle/mech models with cockpit and launcher elements.
Sets typically include multiple minifigure-style characters—commonly two in smaller sets and up to four in more detailed playsets. Some sets also include robotic or creature figures.
