Time Hollow

Time Hollow is a graphic adventure game, in which the player controls protagonist Ethan Kairos as he attempts to find his missing parents. Using the "Hollow Pen", he is able to open circular portals into the past after he has experienced a "flashback" of a certain location. By opening portals into different areas, he is able to recover or place items and people, as well as observe the past. Source: Wikipedia, "Time Hollow", available under the CC-BY-SA License.