100 Doors Underground Stage 4 Walkthrough is shown below with screenshots. The answer for this level is explained in detail in the text. Look at the screenshots for more help. If you only want to look at part of the guide and not cheat, just look at part of the solution. This will help you go to the next level.
1. Pick up the two pieces of the hammer on the left side.
2. Press one piece then press the other in your inventory to combine them. Use it on the vase.