This app was mentioned in 10 comments, with an average of 1.60 upvotes
I've been playing this stupidly addictive puzzle game on my phone called 2048. It's free. You move numbered squares around in a 4x4 field and when you get two same numbers together they squish together and double. The goal is to get to 2048. Best I've done is 1,000 something. Link to Play Store
It's kept me occupied for over a week and I usually delete mobile games after a few days because I get bored.
I used a 2048 app that allowed you to use an 8x8 board (https://play.google.com/store/apps/details?id=com.androbaby.game2048), and over the course of a few months (With saving, of course), I finally got a 65536 tile!
EDIT: I did not use any undos, not that I really needed to though, as it's near impossible to lose an 8x8
#G2ABTS My math professor would mostly play the mobile 2048. Does anyone remember this game? It's a simple multiplication game I'm sure my professor would love. The game link for anyone who wants to try this - https://play.google.com/store/apps/details?id=com.androbaby.game2048&hl=en\_IN&gl=US
This is the one I have.