Bug Battle is a card game against Sam that uses only the cards a student has earned, so it unlocks after 2 finished lessons (at least 5 cards). Every card has Power, Speed, and Brains numbers. Shiny and gold cards have the same numbers as regular ones, so nobody gets an edge from luck. Students pick a team of 5, then play 5 rounds. On odd rounds the student picks a card and the number that counts, against Sam's hidden card. On even rounds Sam plays first and names a number, and the student chooses an answer card. The game saves only a count of battles won. Teacher test mode lets you play with every card without saving.