### **Title:** rev/universal
**Hint:** Observe find and replace
**Solution:**\Flag is present in the hidden sheet named flag and is split into a char in each cell from A1 to AR1.\So, to get the flag we can use the below regex expression on each cell to get the each char of the flag.
**Flag:** `lactf{H1dd3n_&_prOt3cT3D_5h33T5_Ar3_n31th3r}`