My daughter is 24 months and has fallen in love with an app called Sight Word Bingo! Has different levels thAt reward them when they get a BINGO with some sort of cute little interactive bug, not sure what the allure is there! They have a junior version for colors, letters, and shapes, and a separate math version as well…if you are looking for something to keep them productive and occupied whilst waiting somewhere, check it out!
Thanks for the info!