double click flag the lag is real use arrow keys to doge attacks that's it Check out the papyrus underswap version trust me it's better: https://scratch.mit.edu/projects/116150955/ just saying you cannot beat sans okay but there is an ending but it isn't the best for you so try mercy story: you have been fighting sans for a while and now he just wants to end. That is this battle OK there is a genocide ending find out when you beat him.
Never let fear stop you from doing the thing you love never give up til the end.
