"I went to the science museum and played with them and I really liked them," the seven-year-old said.
Some have wheels and others have lights or controllers. The Cubelet blocks are magnetic and can be linked in many ways to form tiny robots.
"I like that they can move," he said. "They can move back and forth or go in circles [depending on the way the controllers are programmed]. I like what I can find for them to do."
Matthew also played with the amusement park construction set and the Bee Bots, self-powered robots that will follow directions programmed by pushing a series of buttons on their backs.
This was the first time the library offered a Tinker with Tech program, said youth services coordinator Randi Kennedy.
The county library system got a grant last year to buy the tech toys.
The Quarryville program ran for several days last week.
"It's a lot easier this way for the kids to come and enjoy what they like," she said. "They can work with what interests them. We got ones that are friendly for a large age group."
On Tuesday, about 15 children came for the program. On Thursday, Martin was the only child to show up early.