| 2025-11-07 09:24:12 | menace | Added credit for Grendel on Patras Muscatel 6: Other (pack editor), Text |
| 2025-08-16 21:23:40 | menace | Updated Grendel's membership of Evil F/X Crew: set as ex-member |
| 2025-08-05 05:59:08 | ericorsio | Added Grendel as organiser of Zoo 2026 |
| 2024-11-17 18:01:58 | menace | Added credit for Grendel on Patras Muscatel 13: Other (pack editor) |
| 2024-11-02 21:51:58 | Brittle | Added credit for Grendel on SD2IEC ESP32: Other (camera) |
| 2024-10-30 11:48:52 | Brittle | Added Grendel as organiser of Zoo 2024 |
| 2024-10-09 14:49:29 | tero_risti | Added credit for Grendel on Jopottaa!: Text |
| 2024-03-29 14:43:42 | menace | Added credit for Grendel on Hassans Vectorballs: Text |
| 2024-03-29 14:40:36 | menace | Added Grendel as organiser of Byterapers - Scoopex - Bloodsuckers Gathering 1991 |
| 2024-03-29 14:39:22 | menace | Added credit for Grendel on Gathering 91 Invitation: Text |
| 2024-03-29 08:44:44 | menace | Added credit for Grendel on Two Windows: Text |
| 2024-02-24 13:49:09 | psenough | Added credit for Grendel on Partydemo: Text |
| 2024-02-24 12:12:20 | psenough | Added credit for Grendel on Mega-Mix: Text |
| 2023-11-09 06:09:48 | menace | Added credit for Grendel on Patras Muscatel 09: Other (pack editor) |
| 2023-09-24 02:19:06 | T-101 | Set real name |
| 2023-09-16 07:08:58 | menace | Added credit for Grendel on History Disk 1: Other (pack editor) |
| 2023-08-10 21:48:04 | tero_risti | Added Grendel as organiser of Byterapers, Scoopex, Extasy Party 1990 |
| 2023-08-10 21:25:01 | tero_risti | Added credit for Grendel on Feel the Power: Text |
| 2023-05-20 16:07:16 | psenough | Added credit for Grendel on Demojournal #68: Text (Interviewed) |
| 2023-05-10 05:18:10 | menace | Added credit for Grendel on Maggy 10: Text |
| 2022-03-14 09:31:05 | Brittle | Added Grendel as organiser of Zoo 2022 |
| 2022-02-26 09:31:45 | Rebel_O-Conner | Added credit for Grendel on Extremes: Text |
| 2022-02-08 19:32:42 | menace | Added credit for Grendel on History Disk 3: Text |
| 2021-05-19 15:51:47 | Brittle | Added Grendel as organiser of Zoo Online 2021 |
| 2021-05-17 08:36:26 | menace | Set real name |
| 2021-05-17 08:36:21 | menace | Set location to Iisalmi, Ylä-Savo, North Savo, Finland |
| 2021-05-16 19:26:45 | menace | Updated Grendel's credit on Scandinavian News 6: Text (partytime editor) |
| 2021-01-13 02:29:55 | dipswitch | Added Grendel as organiser of Byterapers Grendelparty 1988 |
| 2020-11-22 10:20:53 | menace | Added credit for Grendel on Patras Muscatel 8: Other (pack editor), Text |
| 2019-07-12 18:39:49 | 100bit | Added credit for Grendel on Contact Wideload: Graphics (Charset) |
| 2018-08-28 14:08:48 | sensenstahl | Added Grendel as a member of Evil F/X Crew |
| 2018-06-20 17:51:31 | sensenstahl | Added Grendel as a member of XPRESS |
| 2018-02-26 18:36:08 | Brittle | Added link https://twitter.com/JukkaOKauppinen |
| 2017-03-29 20:15:10 | menace | Added credit for Grendel on Universal Intensity: Text |
| 2016-01-26 06:08:00 | menace | Updated visibility of real name |
| 2016-01-26 06:06:57 | menace | Added link http://www.pouet.net/user.php?who=14998 |
| 2016-01-23 08:13:52 | menace | Added credit for Grendel on First Official Demo: Text |
| 2016-01-16 07:35:59 | menace | Added link http://noname.c64.org/csdb/scener/?id=571 |
| 2016-01-16 07:35:46 | menace | Edited notes |
| 2016-01-16 07:32:52 | menace | Added credit for Grendel on Scandinavian News 2: Text (party report) |
| 2014-07-11 12:44:40 | dipswitch | Added nick 'Boltarse' |
| 2014-07-11 12:44:29 | dipswitch | Added Grendel as a member of SCUP |
| 2012-08-26 10:50:11 | menace | Added link http://byterapers.scene.org/members-grendel.htm |