Entering this wondrous realm means getting trapped within an equally remarkable bureaucracy. Fortunately, to get through customs, all you need to do is divine the answers to every riddle in the world. (Some riddles are multipart, and every answer must be entered in at least one of the specified places on this really, really big page.)
Across
1 Well-known cryptic constructor in a rage (5)
6 Taking care of that old louse (2 2)
7 At first, oranges are green (5)
8 Newly ranking Roman was wearing jewelry (8)
9 Opening for Kingston Trio in Arlington or Malden (4)
10 Of the skull's now-horizontal curve to the left (7)
11 Charlie vows or promises to start getting retro with regard to linguistic rhythm (8)
13 Western footballer evacuated inhospitable Wyoming city (7)
15 Actor Alda portrays singer Morissette (6)
16 Spigots emitted liquid the wrong way (4)
18, 37 Hearts embracing hard tasks valley-dwelling Molly would give author Eliot (6)(6)
19 It claims tin fails to exist (3'1)
22 Groovy piano lid slammed shut that way (4)(4)
25 Capital's wild animal sanctuary's red-infused glow (6)(6)
26 Court claims you know something definite for each posh country (4)(4)
28 Regret having large code symbol (dash dot) in Morse (4)(4)
29 What Omani freebies cost for someone who attests nonsense song is by Navy service club member (8)(8)
31 Semi-safe hideaway for most rational sextet crossing really anticlimactic river in Norwich, CT (6)(6)
33 Ray & Glen's idiosyncratic voice boxes squelch the twelfth letter in "idiosyncratic" (8)(8)
35 Scottish motto's last word is "cleats," "anagrammed," "radius," "absent," "snafus," or "pharaoh" (8)(8)
39, 53 Toss pet a piece of lamb aspic and such, for ultimately bringing joy and connecting emotionally (8)(8)
40 Love Italia's capital, which is Wheeling (4)
41, 59 Some grimacing computer confused Mini-Me too (4)(1'1 2)
42 Cutters chiefly split or cut rinds back, or saw wood (5)(5)
44 Gold around killer whale bones reflected like so (4)(4)
46 Endlessly nosy gp. that launches sports org. can ground Ace (4, abbr.)(4, abbr.)
48, 70 Wild Louisiana zebra flipped over the Ra-smashing father of Abraham (5)(5)
49 Exclamations indicating insight one has about stuff for Greek characters (4)(4)
54 Man, I spent 50 or 60 shekels to get a bagel for a sot (4)(4)
56 Read opening description of red meat that's not commonplace (4)(4)
58 Unfortunately, Al's having a cuckoo group banish naked people from Yale's topless eateries (4)(4)(4)
60 Stats guy Silver then finally had seen unusual suffix for "Shanghai" or "Goa" (4)(4)
62 Max gets northern Celtic men Yoko's nonstereo retrospective on an iPod (4)(4)(4)
64 Literary friar with king edited retreating pharaoh's disapproving comments (4)(4)
66 Units that are energetic medical facilities sheltering a thousand types of Missouri neighbors (4)(4)
68 Invent less adult island deity who inspires English singer Oscar (5)(5)
71 Originally, Troy's depilatory substance cult outwardly constitutes religious group (4)(4)
Down
1 People transforming liquid into regular dowsing-rod-like item in a square two columns west of each 3D in the grid (4)
2 Archaic term for "close to one listener" (5)
3 Note train or item that must be installed vertically down the center of each column two squares east of a 1D in the grid (6)
4 Arising tardily, along with some others (2 2, abbr.)
5 Technetium blocks destroy online firm (6)
11 Actor Morita has little plan (4)
12, 45 Chat with California operator that is lacking ink that ornaments fairness remarkably (8)(8)
14 1150 boring stone trails in the same style as a real eye-opener (5 5)
17 Becoming pole- and lariat-user (6)
18, 51 Sad lady covered with sticky stuff (4)
20 Mr. Marner — yes, the Spanish Fleming — is ascending a sacred mountain (5)(5)
21 Diplomacy involving one silent duck and alien that's turned unenthusiastic (5)(5)
22 Beforehand, concur terribly eager rep there's seizing neighboring UK playhouses (8)(8)
23 Prickly, shirtless, callused Henry addresses casts (5)(5)
24 Writer Ephron's reversible green garment strap captivates radical crowd (6)(6)
27 Errant finks mixed pigment for printing T-shirts nonresponsive nun's wearing illicitly (8 3)(11)
30, 65 Wine bottles in instrument case from Texas and Arizona's gutless empresses (8)(8)
32 Sexy actor Bana gets overtime scattering silt on schedule (6)(4 2)
34 Told to look for a line of clothing that makes tense women relax (4)(4)
36, 72 Danish brick's less long, as vanities were in Virgil's times (4)(4)
38 Bravo publicity worker, before a Christmas film scene, can misread "birth" (3 5)(8)
43 Penny and Arthur divide Welsh river in Stafford (4)(4)
47 Spiritual interpretations of one's gaga, silly pirate toast concluded (8)(3 5)
50 Mortgage 25% of honeydew melon to get a gizmo that eventually opens Coke Milt agitated (4 4)(4 4)
52 2/3 of Gramp's 5-carat funereal ring's bottom edge damaged Pam's meat roll and small brooch (4)(4)(4)(4)
55 Twisted Sisters actress Ward presents many a beer run as a game of chance, perversely (4)(3-1)
57 Civil War battle opponent and ally put up messy hair & went nude (8)(2 3 3)
61 Glow surrounding $1000 tin for cheese-covered and browned wild rice I cut with basic gabbro (2 6)(8)
63 Lace-ripping Guinness, upright Croft, and a sea god heard the Ram King's wild foal (4)(4)(4)(4)
66 Island's anger rising over new flower I almost endanger (4)(4)
67 Badger Spot with ridiculous test at the conclusion that's frequently not hard (4)(4)
68 Yak disheartened 66' antelope with no drive or esprit (4)(4)
69 Where you'll see skaters sporadically irk nice person who's noble and barely dingy-looking (3 4)(7)
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