How to: Locate your save files

Save files can be located at the following locations:

Windows

X:\Program Files (x86)\Steam\userdata\Your User ID\230190\remote

OS X

~/Library/application support/steam/userdata/Your User ID/230190/remote

Linux

~/.local/share/Steam/userdata/userdata/Your User ID/230190/remote

You will need to add both the save file & the meta file. 

These save files will not have the display name that you gave them whilst saving, they will reference the level and a timestamp:

[level_number][map_name][level_name][timestamp]  

4 bonus round  cornucopia_20180418165553

4  bonus round  cornucopia_20180418165553.meta

If you have multiple saves with very similar names, then simply sort you save files by date and you should be able to find you most recent that way.