Sentinel Stones

Sentinel Stones is one of the puzzle types found in Islands of Insight.
== Insights ==
=== Watch for Hidden Pillars ===
Often, you'll find a pillar that is concealed from many locations by another pillar. Finding vantage points that can spot these difficult pillars is one of the keys to solving the Sentinel Stones puzzle. You can middle click to place a beacon on a pillar to help keep track of it.
== Upgrades ==