Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Guerrilla Games
Table title:
Video games
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Game title </th><th colspan=1 rowspan=1 > Year released </th><th colspan=1 rowspan=1 > Platform </th></tr>
<tr> <td colspan=1 rowspan=1 > Shellshock: Nam '67 </td><td colspan=1 rowspan=2 > 2004 </td><td colspan=1 rowspan=1 > Windows PlayStation 2 Xbox </td></tr>
<tr> <td colspan=1 rowspan=1 > Killzone </td><td colspan=1 rowspan=1 > PlayStation 2 </td></tr>
<tr> <td colspan=1 rowspan=1 > Killzone: Liberation </td><td colspan=1 rowspan=1 > 2006 </td><td colspan=1 rowspan=1 > PlayStation Portable </td></tr>
<tr> <td colspan=1 rowspan=1 > Killzone 2 </td><td colspan=1 rowspan=1 > 2009 </td><td colspan=1 rowspan=2 > PlayStation 3 </td></tr>
<tr> <td colspan=1 rowspan=1 > Killzone 3 </td><td colspan=1 rowspan=1 > 2011 </td></tr>
<tr> <td colspan=1 rowspan=1 > Killzone Shadow Fall </td><td colspan=1 rowspan=1 > 2013 </td><td class="highlighted"  colspan=1 rowspan=2 > PlayStation 4 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Horizon Zero Dawn </td><td class="highlighted"  colspan=1 rowspan=1 > 2017 </td></tr>
</table>
Question:
What platform was Horizon Zero Dawn released for in 2017?
Answer:
In 2017, Horizon Zero Dawn was released for PlayStation 4.