| 100% | SAND | 4 | Soft castle-building substance |
| 54% | RETE | 4 | Conc____, building substance |
| 53% | TAR | 3 | Road building gooey substance |
| 48% | TNT | 3 | Substance used in building demolition: Abbr. |
| 47% | CHINACLAY | 9 | Soft white substance also called kaolin |
| 47% | MARROW | 6 | Soft, fatty substance inside bones |
| 47% | PLAQUE | 6 | Soft film that builds on teeth |
| 46% | BEESWAX | 7 | Substance secreted by bees to build honeycombs |
| 46% | SANDBOX | 7 | Place to build a castle |
| 46% | BEACHES | 7 | Where many castles are built |
| 46% | BEACHES | 7 | Where some castles are built |
| 45% | COMPOSITE | 9 | Building material made of a mix of substances |
| 45% | SAND | 4 | Unstable building material for a castle |
| 44% | LOWTIDE | 7 | Good time to build a castle? |
| 44% | TURRET | 6 | Tower built onto a castle wall |
| 44% | BEACH | 5 | Place to build a sand castle |
| 44% | LOWTIDES | 8 | Good times to build sand castles |
| 43% | KYOTO | 5 | Home of Nijo Castle, built by the Tokugawa shogunate |
| 43% | GEL | 3 | Thick, soft jelly-like substance |
| 43% | STONE | 5 | Castle-building material |
| 43% | SAND | 4 | Castle-building stuff |
| 43% | STONE | 5 | Castle-building block |
| 42% | WAXWORKS | 8 | Death masks, famous figures made of soft substance |
| 42% | BORTHWICK | 9 | — Castle, fortification southeast of Edinburgh, Scotland, built in 1430 |
| 42% | BEACH | 5 | Place where you could build a sand castle |
| 42% | MOAT | 4 | First line of defense built around a castle |
| 41% | LOWTIDES | 8 | Castle-building opportunities, maybe |
| 41% | TALC | 4 | Powdered substance used to make skin soft and dry |
| 41% | MATERIALS | 9 | Substances out of which a thing can be made or built |
| 40% | PLASTICKY | 9 | Describes a soft, elastic, malleable substance |