Key for Dudeney's "536 Puzzles & Curious Problems" (DP) as edited by Martin Gardner (New York: Charles Scribner's Sons, 1967), 428pp All puzzles were drawn from the following two original books (MP and PCP): Modern Puzzles and how to solve them (London: C. Arthur Pearson, 1926), 190pp Puzzles and Curious Problems (London: Thomas Nelson, 1932), 195pp (c) 2001 Donald E Knuth [but freely downloadable for personal use in research] ------------------- MP1 = DP1 MP3 = DP2 MP4 = DP3 MP6 = DP4 MP7 = DP163 MP8 = DP5 MP10 = DP6 MP11 = DP7 MP12 = DP8 MP16 = DP9 MP17 = DP10 MP19 = DP11 MP20 = DP12 MP21 = DP32 MP22 = DP33 MP23 = DP34 MP24 = DP35 MP25 = DP46 MP26 = DP47 MP28 = DP56 MP29 = DP57 MP30 = DP58 MP31 = DP59 MP32 = DP60 MP33 = DP61 MP34 = DP62 MP35 = DP63 MP36 = DP64 MP37 = DP65 MP38 = DP66 MP39 = DP67 MP40 = DP68 MP41 = DP69 MP42 = DP70 MP43 = DP71 MP44 = DP72 MP45 = DP73 MP46 = DP74 MP47 = DP75 MP48 = DP374 MP49 = DP76 MP50 = DP77 MP51 = DP102 MP52 = DP103 MP53 = DP104 MP54 = DP105 MP55 = DP106 MP56 = DP107 MP57 = DP108 MP58 = DP109 MP59 = DP110 MP60 = DP111 MP61 = DP112 MP62 = DP113 MP63 = DP114 MP64 = DP115 MP65 = DP116 MP66 = DP117 MP67 = DP118 MP68 = DP119 MP69 = DP120 MP70 = DP144 MP71 = DP145 MP72 = DP151 MP73 = DP152 MP74 = DP121 MP78 = DP160 MP79 = DP161 MP80 = DP162 MP81 = DP164 MP82 = DP165 MP83 = DP166 MP84 = DP167 MP85 = DP168 MP86 = DP169 MP87 = DP170 MP88 = DP171 MP89 = DP172 MP90 = DP173 MP91 = DP174 MP92 = DP175 MP93 = DP176 MP94 = DP143 MP95 = DP177 MP96 = DP178 MP97 = DP179 MP98 = DP180 MP99 = DP181 MP101 = DP182 MP102 = DP138 MP103 = DP327 MP104 = DP328 MP105 = DP329 MP106 = DP302 MP107 = DP330 (first part) MP108 = DP331 MP109 = DP332 MP110 = DP333 MP111 = DP334 MP112 = DP335 MP113 = DP336 MP114 = DP337 MP115 = DP338 MP116 = DP339 MP117 = DP340 MP118 = DP341 MP119 = DP342 MP121 = DP361 MP122 = DP362 MP123 = DP363 MP124 = DP303 MP125 = DP257 MP126 = DP304 MP127 = DP258 MP128 = DP259 MP129 = DP287 MP130 = DP260 MP131 = DP261 MP132 = DP262 MP133 = DP263 MP134 = DP264 MP135 = DP479 MP136 = DP494 MP137 = DP495 MP138 = DP265 MP139 = DP366 MP140 = DP442 MP141 = DP312 MP142 = DP313 MP143 = DP314 MP144 = DP305 MP145 = DP315 MP146 = DP316 MP147 = DP317 MP148 = DP318 MP149 = DP435 MP150 = DP368 MP151 = DP416 MP152 = DP369 MP153 = DP370 MP154 = DP411 MP155 = DP412 MP156 = DP413 MP157 = DP414 MP158 = DP415 MP160 = DP417 MP162 = DP325 MP163 = DP281 MP164 = DP282 MP165 = DP311 MP166 = DP445 MP167 = DP446 MP168 = DP447 MP169 = DP398 MP170 = DP399 MP171 = DP384 MP172 = DP385 MP173 = DP386 MP174 = DP387 MP175 = DP388 MP176 = DP393 MP177 = DP394 MP178 = DP395 MP179 = DP396 MP180 = DP453 MP181 = DP454 MP182 = DP481 MP183 = DP403 MP184 = DP404 MP185 = DP405 MP186 = DP97 MP187 = DP98 MP188 = DP246 MP189 = DP99 MP190 = DP326 MP191 = DP448 MP192 = DP449 MP193 = DP482 MP194 = DP483 MP195 = DP484 MP196 = DP485 MP197 = DP511 MP198 = DP183 MP199 = DP451 MP201 = DP452 MP202 = DP471 MP203 = DP472 MP204 = DP473 MP205 = DP474 MP206 = DP475 MP207 = DP476 MP208 = DP477 MP209 = DP293 MP210 = DP294 MP211 = DP295 MP212 = DP513 MP213 = DP383 MP214 = DP367 MP215 = DP498 MP216 = DP499 MP217 = DP500 MP218 = DP514 MP219 = DP516 MP220 = DP517 MP221 = DP518 MP222 = DP296 PCP2 = DP13 PCP4 = DP14 PCP5 = DP15 PCP6 = DP16 PCP9 = DP17 PCP11 = DP18 PCP12 = DP19 PCP14 = DP20 PCP15 = DP21 PCP16 = DP22 PCP17 = DP23 PCP18 = DP24 PCP19 = DP25 PCP20 = DP26 PCP21 = DP27 PCP29 = DP154 PCP31 = DP28 PCP32 = DP29 PCP33 = DP30 PCP34 = DP31 PCP39 = DP519 PCP40 = DP520 PCP41 = DP36 PCP42 = DP37 PCP43 = DP38 PCP44 = DP39 PCP45 = DP40 PCP46 = DP41 PCP47 = DP184 PCP48 = DP45 PCP49 = DP521 PCP50 = DP186 PCP51 = DP185 PCP52 = DP42 PCP53 = DP43 PCP54 = DP44 PCP56 = DP48 PCP57 = DP49 PCP58 = DP50 PCP59 = DP51 PCP60 = DP52 PCP61 = DP53 PCP62 = DP54 PCP63 = DP55 PCP64 = DP78 PCP65 = DP79 PCP66 = DP80 PCP67 = DP81 PCP68 = DP82 PCP69 = DP83 PCP70 = DP84 PCP71 = DP85 PCP72 = DP86 PCP73 = DP87 PCP74 = DP88 PCP75 = DP89 PCP76 = DP90 PCP77 = DP91 PCP78 = DP92 PCP79 = DP93 PCP80 = DP94 PCP81 = DP95 PCP82 = DP96 PCP83 = DP122 PCP85 = DP187 PCP86 = DP123 PCP87 = DP124 PCP88 = DP125 PCP89 = DP126 PCP90 = DP127 PCP91 = DP128 PCP92 = DP129 PCP93 = DP153 PCP94 = DP146 PCP95 = DP155 PCP96 = DP156 PCP97 = DP157 PCP99 = DP158 PCP100 = DP130 PCP101 = DP131 PCP102 = DP132 PCP103 = DP137 PCP104 = DP159 PCP105 = DP133 PCP106 = DP134 PCP107 = DP135 PCP108 = DP136 PCP109 = DP188 PCP110 = DP147 PCP111 = DP148 PCP112 = DP149 PCP113 = DP150 PCP114 = DP189 PCP115 = DP139 PCP116 = DP190 PCP117 = DP191 PCP118 = DP192 PCP119 = DP193 PCP120 = DP194 PCP121 = DP140 PCP122 = DP195 PCP123 = DP196 PCP124 = DP197 PCP125 = DP198 PCP126 = DP199 PCP127 = DP200 PCP128 = DP201 PCP129 = DP202 PCP130 = DP203 PCP131 = DP204 PCP132 = DP205 PCP133 = DP206 PCP134 = DP207 PCP135 = DP208 PCP136 = DP209 PCP137 = DP210 PCP138 = DP211 PCP139 = DP212 PCP141 = DP213 PCP142 = DP214 PCP143 = DP215 PCP144 = DP216 PCP145 = DP217 PCP146 = DP218 PCP147 = DP219 PCP148 = DP220 PCP149 = DP221 PCP150 = DP222 PCP151 = DP223 PCP152 = DP224 PCP153 = DP266 PCP154 = DP225 PCP155 = DP228 PCP156 = DP141 PCP157 = DP510 PCP159 = DP226 PCP160 = DP227 PCP161 = DP229 PCP162 = DP230 PCP163 = DP480 PCP164 = DP231 PCP165 = DP232 PCP168 = DP233 PCP169 = DP234 PCP170 = DP235 PCP171 = DP236 PCP172 = DP142 PCP173 = DP237 PCP174 = DP238 PCP175 = DP239 PCP176 = DP240 PCP177 = DP343 PCP178 = DP344 PCP179 = DP345 PCP180 = DP346 PCP181 = DP347 PCP182 = DP348 PCP183 = DP349 PCP184 = DP330 (second part) PCP185 = DP353 PCP186 = DP350 PCP187 = DP351 PCP188 = DP289 PCP189 = DP352 PCP190 = DP354 PCP191 = DP356 PCP192 = DP418 PCP193 = DP355 PCP194 = DP357 PCP195 = DP358 PCP198 = DP359 PCP199 = DP267 PCP200 = DP306 PCP201 = DP364 PCP202 = DP268 PCP203 = DP269 PCP204 = DP270 PCP205 = DP271 PCP206 = DP286 PCP207 = DP301 PCP208 = DP272 PCP209 = DP273 PCP210 = DP307 PCP211 = DP496 PCP212 = DP437 PCP213 = DP443 PCP214 = DP444 PCP215 = DP360 PCP216 = DP297 PCP217 = DP288 PCP218 = DP299 PCP219 = DP274 PCP220 = DP298 PCP221 = DP319 PCP222 = DP365 PCP223 = DP241 PCP224 = DP320 PCP225 = DP275 PCP226 = DP290 PCP227 = DP242 PCP228 = DP308 PCP229 = DP243 PCP230 = DP276 PCP231 = DP279 PCP232 = DP244 PCP233 = DP321 PCP235 = DP322 PCP236 = DP323 PCP237 = DP245 PCP238 = DP309 PCP239 = DP310 PCP240 = DP277 PCP241 = DP278 PCP242 = DP280 PCP243 = DP324 PCP244 = DP291 PCP245 = DP371 PCP246 = DP372 PCP247 = DP285 PCP248 = DP455 PCP249 = DP373 PCP250 = DP375 PCP251 = DP376 PCP252 = DP377 PCP253 = DP378 PCP254 = DP379 PCP255 = DP438 PCP256 = DP380 PCP257 = DP439 PCP258 = DP440 PCP259 = DP456 PCP260 = DP522 PCP261 = DP419 PCP262 = DP421 PCP263 = DP420 PCP264 = DP422 PCP265 = DP423 PCP266 = DP424 PCP267 = DP425 PCP268 = DP426 PCP269 = DP427 PCP270 = DP428 PCP271 = DP300 PCP272 = DP429 PCP273 = DP457 PCP275 = DP458 PCP276 = DP459 PCP277 = DP460 PCP278 = DP461 PCP279 = DP400 PCP280 = DP462 PCP281 = DP497 PCP282 = DP401 PCP283 = DP248 PCP284 = DP463 PCP286 = DP247 PCP287 = DP464 PCP288 = DP465 PCP289 = DP389 PCP290 = DP390 PCP291 = DP391 PCP292 = DP392 PCP293 = DP436 PCP294 = DP406 PCP295 = DP249 PCP296 = DP407 PCP297 = DP408 PCP298 = DP409 PCP299 = DP250 PCP300 = DP100 PCP301 = DP101 PCP302 = DP410 PCP303 = DP450 PCP304 = DP381 PCP305 = DP486 PCP308 = DP487 PCP309 = DP488 PCP310 = DP489 PCP311 = DP490 PCP312 = DP491 PCP313 = DP492 PCP314 = DP512 PCP315 = DP493 PCP316 = DP466 PCP317 = DP467 PCP318 = DP468 PCP319 = DP478 PCP320 = DP523 PCP321 = DP524 PCP323 = DP251 PCP324 = DP525 PCP325 = DP283 PCP327 = DP526 PCP328 = DP284 PCP329 = DP382 PCP330 = DP430 PCP331 = DP431 PCP332 = DP432 PCP333 = DP433 PCP334 = DP501 PCP335 = DP502 PCP336 = DP503 PCP337 = DP504 PCP338 = DP505 PCP339 = DP506 PCP340 = DP507 PCP341 = DP508 PCP342 = DP434 PCP343 = DP469 PCP344 = DP527 PCP345 = DP252 PCP346 = DP528 PCP347 = DP253 PCP348 = DP529 PCP349 = DP530 PCP350 = DP531 PCP351 = DP532 PCP352 = DP254 PCP353 = DP255 PCP354 = DP292 PCP355 = DP470 PCP356 = DP256 PCP357 = DP402 PCP358 = DP515 PCP359 = DP509 PCP360 = DP397 PCP361 = DP441 PCP362 = DP533 PCP363 = DP534 PCP364 = DP535 PCP365 = DP536