Author here, I did not notice any numbers disappearing on several games, maybe it is because of different versions of bash, you can try running it as: ./bash20

Author here, I did not notice any numbers disappearing on several games, maybe it is because of different versions of bash, you can try running it as: ./bash2048.sh | tee qqq.log then remove color codes from log by running: sed -r -i "s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g" qqq.log you can then see each round in the log and it should be easy to find the spot where numbers disappeared, if you could post that log somewhere it may help me find the problem.