The puzzles are already available for preorder. Whether or not the bass will be audible on the Justice puzzle remains to be seen.
This is of course not the most insane merch available from a band. Pantera have everything from strollers to era-specific figurines for sale. Neck Deep have released Valentine's Day merch. Metallica themselves have launched sneakers, among other pieces of limited-edition swag. Hell, Slayer made a video about all the cool stuff with their name on it they've seen over the years.
Meanwhile, Metallica will be touring Europe and Australia later this year (the latter continent with Slipknot), so catch them live at one of the following dates:
July
18 Tartu, Estonia @ Raadi Airfield
21 Moscow, Russia @ Luzhniki Stadium
August
14 Bucharest, Romania @ Arena Națională
16 Vienna, Austria @ Ernst-Happel-Stadion
18 Prague, Czech Republic @ Airport Letnany
21 Warsaw, Poland @ PGE Narodowy
23 Munich, Germany @ Olympiastadion
25 Mannheim, Germany @ Palastzelt Maimarktgelände
September
6 San Francisco, CA @ Chase Center - S&M Anniversary show
8 San Francisco, CA @ Chase Center - S&M Anniversary show
October
17 Perth, Australia @ Optus Stadium
20 Adelaide, Australia @ Adelaide Oval
22 Melbourne, Australia @ Marvel Stadium
24 Melbourne, Australia @ Marvel Stadium
26 Sydney, Australia @ ANZ Stadium
29 Brisbane, Australia @ QSAC
31 Auckland, New Zealand @ Mt. Smart Stadium
November
2 Auckland, New Zealand @ Mt. Smart Stadium
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