A main part of the 0.0.3 update for Twardy 2.0 is the inclusion of ruins. So far, there are three main mechanics for ruins: ruin generation, Ruin Ghosts, and old documents. This Twardy 2.0 Devlog post will explain everything apart of the ruins.

Ruin Generation

Ruins won't be very common in a Twardy 2.0 world; only 7-12 will generate. Ruins are 256 x 256 pixels big. That's about quadruple the size of Mark (the player character). Ruins don't really do anything on their own; that's where the second mechanic comes in:

Ruin Ghosts

Ruin Ghosts have a chance to generate by ruins. They won't attack you until you're <350 pixels close to them. Ruin Ghosts do 0.75 damage on impact.

Old Documents

If Mark collides with the paper at the ruins, 1 of 2 (and more planned) documents will appear on screen. The documents are caesar ciphered, so you need a decoder to read them. To hide the documents, just left-click on them. Note that once you hide the document, you won't be able to view it again until you collide with the ruins again.

All of this is coming out in the 0.0.3 update, so stay tuned for more information!