Weekly Challenge are Achievements available under the Special tab within the Achievements menu. A new Weekly Challenge Achievements arrives every Friday at 08:00 (8:00 a.m.) GMT (early April - late October) or at 09:00 (9:00 a.m.) GMT (late October - early April). Once completed, they appear under the Finished Achievements tab.
2021
| Date | Order |
|---|---|
| 18 Jun 2021 | [[../Unrecognised input "ise" Recheck!|Unrecognised input "ise" Recheck!]] (current) |
| 11 Jun 2021 | Bismuth |
| 4 Jun 2021 | Local Maglevs |
| 28 May 2021 | Bricks |
| 21 May 2021 | Lithium |
| 14 May 2021 | Nails |
| 7 May 2021 | [[../Unrecognised input "lse" Recheck!|Unrecognised input "lse" Recheck!]] |
| 30 Apr 2021 | IT Maglevs |
| 23 Apr 2021 | Borax |
| 16 Apr 2021 | Wood |
| 9 Apr 2021 | Local Hyperloops |
| 2 Apr 2021 | Neodymium |
| 26 Mar 2021 | IT Steam |
| 19 Mar 2021 | Rubber |
| 12 Mar 2021 | Plastics |
| 5 Mar 2021 | Local Maglevs |
| 26 Feb 2021 | Wolfram |
| 19 Feb 2021 | Wires |
| 12 Feb 2021 | IT Electrics |
| 5 Feb 2021 | Marble |
| 29 Jan 2021 | Nanotubes |
| 22 Jan 2021 | Titanium |
| 15 Jan 2021 | IT Hyperloops |
| 8 Jan 2021 | Carbon |
| 1 Jan 2021 | [[../Unrecognised input "lse" Recheck!|Unrecognised input "lse" Recheck!]] |
2020
| Date | Order |
|---|---|
| 25 Dec 2020 | Neodymium |
| 18 Dec 2020 | Rubber |
| 11 Dec 2020 | IT Electrics |
| 4 Dec 2020 | Steel |
| 27 Nov 2020 | Local Steams |
| 20 Nov 2020 | Local Diesel |
| 13 Nov 2020 | Xenon |
| 6 Nov 2020 | Local Maglevs |
| 30 Oct 2020 | U-235 |
| 23 Oct 2020 | Aerogel |
| 16 Oct 2020 | Cement |
| 9 Oct 2020 | IT Maglevs |
| 2 Oct 2020 | Bismuth |
| 25 Sep 2020 | Fuel |
| 18 Sep 2020 | Gravel |
| 11 Sep 2020 | Silicon |
| 4 Sep 2020 | IT Diesels |
| 28 Aug 2020 | Glass |
| 21 Aug 2020 | [[../Unrecognised input "ise" Recheck!|Unrecognised input "ise" Recheck!]] |
| 14 Aug 2020 | Lithium |
| 7 Aug 2020 | Nails |
| 31 Jul 2020 | IT Steam |
| 24 Jul 2020 | Borax |
| 17 Jul 2020 | Wood |
| 10 Jul 2020 | Local Electrics |
| 3 Jul 2020 | Bricks |
| 26 Jun 2020 | Local Hyperloops |
| 19 Jun 2020 | [[../Unrecognised input "lse" Recheck!|Unrecognised input "lse" Recheck!]] |
| 12 Jun 2020 | Nanotubes |
| 5 Jun 2020 | Wires |
| 29 May 2020 | Marble |
| 22 May 2020 | Titanium |
| 15 May 2020 | IT Hyperloops |
| 8 May 2020 | Carbon |
| 1 May 2020 | Wolfram |
| 24 Apr 2020 | U-235 |
| 17 Apr 2020 | Local Maglevs |
| 10 Apr 2020 | Aerogel |
| 3 Apr 2020 | Steel |
| 27 Mar 2020 | Local Diesel |
| 16 Mar 2020 | Local Steams |
| 9 Mar 2020 | Plastics |
| 2 Mar 2020 | Xenon |
| 24 Feb 2020 | Cement |
| 17 Feb 2020 | IT Maglevs |
| 10 Feb 2020 | Bismuth |
| 3 Feb 2020 | Fuel |
| 27 Jan 2020 | Gravel |
| 20 Jan 2020 | Local Hyperloops |
| 13 Jan 2020 | Silicon |
| 6 Jan 2020 | IT Diesels |
2019
| Date | Order |
|---|---|
| 30 Dec 2019 | Glass |
| 23 Dec 2019 | Local Steams |
| 16 Dec 2019 | Local Electrics |
| 9 Dec 2019 | Bricks |
| 2 Dec 2019 | [[../Unrecognised input "ise" Recheck!|Unrecognised input "ise" Recheck!]] |
| 25 Nov 2019 | Lithium |
| 18 Nov 2019 | IT Steam |
| 11 Nov 2019 | Nails |
| 4 Nov 2019 | Local Maglevs |
| 28 Oct 2019 | Borax |
| 21 Oct 2019 | IT Hyperloops |
| 14 Oct 2019 | [[../Unrecognised input "lse" Recheck!|Unrecognised input "lse" Recheck!]] |
| 7 Oct 2019 | Wolfram |
| 30 Sep 2019 | Local Diesel |
| 23 Sep 2019 | Wood |