The immortal struggle between pigs and wolves escalates in Pooyan, wherein the wolves take up kidnapping and the pigs take up archery.
These two unused strings explain the escalating difficulty of the game's second phase.
The first string starts at $7D44 in memory:
2ND PHASE GETS HARDER AS YOU LOSE MORE PIGS
The second string starts at $7D78:
DIFFICULT IN THE SECOND PHASE ABOUT 10 SECONDS
The title font is a tad thicker in Stern's version of the game.
The first game demo was redone for Stern's release to showcase more highly skilled gameplay.
The Konami original has only one gameplay demo, while Stern's version has two alternating demos. In this second demo, the player successfully completes Phase 1, and the mechanics of Phase 2 are shown and explained.
Even though Konami's version features only one demo, the "GIAHT ROCK" string from the second demo appears in that game's ROM. Looks like it was planned from the start!