Hint: Row 2's missing letter is L.

Answer:

Across: JOYS, LAKE, COME, HARP
Down  : MORE, JACK, YEAH, SLOP
Boxes : JOKE, LAYS, CRAM, HOPE
Note  : Other anagrams of these words are OK as long as they don't change the answer grid.

Hint: Start anywhere and see which squares are missing.

Answer: Start with the 3U on the 5th row down and the 6th column across.

Hint: Pages 1-9 are one digit each...

Answer: There are 65 pages and the number 9 appears 6 times.

Hint: Say what you see.

Answer: Up-market.

Hint: Remember every word must contain the central letter.

Answer: Common words: ego, enrol, eon, ergo, giro, glories, go, gone, goner, gore, groin, ignore, insole, ion, iron, ironies, legion, lesion, lingo, lion, log, loin, lone, loner, long, longer, lore, lose, loser, losing, no, noise, noisier, nor, nose, nosier, ogle, ogler, ogre, oil, oiler, oilier, oiling, on, one, or, ore, orgies, origin, region, religion, RELIGIONS, roe, role, rose, senior, silo, sirloin, slog, snore, so, soil, soiling, sol, sole, son, song, sore.

All words: ego, egos, elision, eloign, eloigns, eloin, eloins, enol, enols, enrol, enrols, eon, eons, eosin, ergo, eringo, eringos, eros, genro, genros, giro, giron, girons, giros, glories, go, goer, goers, goes, gone, goner, goners, gor, gore, gores, gorse, grison, groin, groins, ignore, ignores, inro, insole, ion, ionise, ions, iron, irone, irones, ironies, irons, isoline, legion, legions, leno, lenos, lesion, ligroin, ligroine, LIGROINES, ligroins, lingo, lingoes, lino, linos, lion, lionise, lioniser, lions, lo, log, loge, loges, logier, logs, loin, loins, lone, loner, loners, long, longe, longer, longers, longes, longies, longs, lore, lores, lories, loris, lorn, lose, loser, losing, nerol, neroli, nerolis, nerols, no, noel, noels, noes, nog, nogs, noil, noils, noir, noirs, noise, noisier, nor, nori, noris, nos, nose, nosier, oe, oes, ogle, ogler, oglers, ogles, ogre, ogres, oil, oiler, oilers, oilier, oiling, oils, ole, olein, oleins, oles, on, one, ones, ons, or, ore, ores, orgies, oriel, oriels, origin, origins, orle, orles, ornis, ors, os, ose, osier, region, regions, religion, RELIGIONS, reoil, reoiling, reoils, resoling, roe, roes, roil, roiling, roils, role, roles, rose, rosin, rosing, segno, sego, seignior, senior, senor, sigloi, signior, signor, signore, signori, silo, siloing, sirloin, sloe, slog, snog, snore, so, soigne, soil, soiling, sol, sole, solei, soli, soling, son, sone, song, sore, sorel, sori, soring, sorn.