Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Game | Genre | Platform(s) | Developer(s) |
| --- | --- | --- | --- | --- |
| 2006.0 | Gears of War | Tactical Shooter | Xbox 360 , Windows | Epic Games |
| 2007.0 | Portal | Puzzle , first-person shooter , science fiction | Xbox 360 , PlayStation 3 , Windows | Valve Corporation |
| 2008.0 | Fable II | Action RPG , Sandbox | Xbox 360 | Lionhead Studios |
| 2009.0 | Uncharted 2: Among Thieves | Third-person shooter | PlayStation 3 | Naughty Dog |
| 2010.0 | Mass Effect 2 | RPG | Xbox 360 , Windows , PlayStation 3 | BioWare |
| 2011.0 | The Elder Scrolls V: Skyrim | Open World : RPG | Xbox 360 , PlayStation 3 , PC | Bethesda Game Studios |
| 2012.0 | Journey | Adventure | PlayStation 3 | thatgamecompany |
Question:
What year was Portal?
Answer:
2007.0