Memory pairs, head to head, where the matching cards are synonyms. Find a match to keep the pair and go again. Most pairs wins.
Built for an interactive whiteboard or a shared tablet, taking turns. The go-again rule means sharp memory snowballs, so encourage both teams to watch EVERY flip, even the other team's. Matched pairs stay on the board in the winning team's colour, and the recap at the end is worth reading aloud together.