| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| when does portal 1 take place | 0.18 | 0.2 | 6143 | 2 |
| what year does portal 1 take place | 0.97 | 0.1 | 3760 | 38 |
| when does portal take place | 0.53 | 1 | 7451 | 3 |
| when does portal 2 take place | 0.89 | 0.2 | 7510 | 15 |
| what year does portal take place | 0.18 | 0.4 | 9834 | 96 |
| when does the portal game take place | 1.77 | 0.9 | 8869 | 48 |
| what year does portal 2 take place | 0.56 | 0.2 | 8001 | 78 |
| portal 1 release date | 1.89 | 0.7 | 2223 | 79 |
| when did portal 1 come out | 1.78 | 0.3 | 9448 | 10 |
| when did portal 1 release | 1.21 | 0.2 | 9523 | 93 |
| when was portal 1 released | 0.23 | 0.8 | 8595 | 3 |
| portal 1 game release date | 1.84 | 0.4 | 7015 | 8 |
| when was portal 1 created | 0.9 | 0.1 | 8256 | 32 |
| when was portal 1 made | 0.75 | 0.6 | 6293 | 28 |
| portal 1 full game | 1.6 | 0.5 | 5554 | 4 |
| how long is portal 1 | 1.43 | 0.2 | 9533 | 80 |
| when is portal set | 1.87 | 0.9 | 7502 | 16 |
| when does portals come out | 1 | 0.1 | 3975 | 74 |
| portal 1 full walkthrough | 0.91 | 0.3 | 6168 | 81 |
| portal 1 ending explained | 1.28 | 0.3 | 5514 | 15 |
| what happened between portal 1 and 2 | 0.43 | 0.6 | 4475 | 74 |
| time between portal 1 and 2 | 1.69 | 1 | 5681 | 88 |
