"There was no point where it was boring."
Angika Gunarathna, 12, said it encouraged her to think more about what careers she could go into.
Mastercard account manager Debbie Bell said she wanted to introduce the students to technology and facilitate their learning.
"It's about trying to inspire and encourage them to keep up with STEM subjects so they can think about careers in them."
New Zealand First deputy leader Fletcher Tabuteau first heard about the Girls4Tech initiative in Parliament and asked Mastercard if they had any initiatives in Rotorua.
"I used to be a careers adviser. The challenge is to open up young people's eyes to the possibilities, so anything you can do is good.
"This is perfect in that it opened the kids' eyes to the possibility and potential. They are not making firm career choices now but the brain is firing up thinking about the possibilities."
John Paul College principal Patrick Walsh said the initiative was an "amazing opportunity".
"We're really thrilled with the opportunity they have. The problem solving and being able to work with other girls. It's a great initiative."