| 國語 | cmn-001 |
| 難題 | |
| العربية | arb-000 | التَحَدِّي |
| العربية | arb-000 | تَحَدٍّ |
| العربية | arb-000 | مَسْأَلَة |
| العربية | arb-000 | مُشْكِلَة |
| luenga aragonesa | arg-000 | problema |
| asturianu | ast-000 | problema |
| azərbaycanca | azj-000 | məsələ |
| azərbaycanca | azj-000 | problem |
| башҡорт теле | bak-000 | мәсьәлә |
| беларуская | bel-000 | прабле́ма |
| বাংলা | ben-000 | প্রব্লেম |
| brezhoneg | bre-000 | kudenn |
| български | bul-000 | предизвикателство |
| български | bul-000 | пробле́м |
| català | cat-000 | problema |
| binisayang Sinugboanon | ceb-000 | kalisud |
| čeština | ces-000 | problém |
| čeština | ces-000 | výzva |
| 普通话 | cmn-000 | 困难 |
| 普通话 | cmn-000 | 挑战 |
| 普通话 | cmn-000 | 问题 |
| 普通话 | cmn-000 | 难题 |
| 普通话 | cmn-000 | 麻烦 |
| 國語 | cmn-001 | 令人頭痛 |
| 國語 | cmn-001 | 問題 |
| 國語 | cmn-001 | 困難 |
| 國語 | cmn-001 | 挑戰 |
| 國語 | cmn-001 | 緊要關頭 |
| 國語 | cmn-001 | 要點 |
| 國語 | cmn-001 | 謎 |
| 國語 | cmn-001 | 難事 |
| 國語 | cmn-001 | 麻煩 |
| Hànyǔ | cmn-003 | nan2 ti2 |
| Cymraeg | cym-000 | problem |
| dansk | dan-000 | problem |
| Deutsch | deu-000 | Herausforderung |
| Deutsch | deu-000 | Problem |
| eesti | ekk-000 | kitsikus |
| eesti | ekk-000 | küsimus |
| eesti | ekk-000 | mure |
| eesti | ekk-000 | probleem |
| eesti | ekk-000 | takistus |
| ελληνικά | ell-000 | πρόβλημα |
| ελληνικά | ell-000 | πρόκληση |
| English | eng-000 | Gordian knot |
| English | eng-000 | challenge |
| English | eng-000 | conundrum |
| English | eng-000 | crux |
| English | eng-000 | difficult problem |
| English | eng-000 | hard problem |
| English | eng-000 | nut |
| English | eng-000 | problem |
| English | eng-000 | puzzle |
| English | eng-000 | riddle |
| Esperanto | epo-000 | problemo |
| euskara | eus-000 | arazo |
| suomi | fin-000 | haaste |
| suomi | fin-000 | ongelma |
| suomi | fin-000 | probleemi |
| suomi | fin-000 | vaikeus |
| français | fra-000 | chalenge |
| français | fra-000 | défi |
| français | fra-000 | problème |
| Gàidhlig | gla-000 | duilgheadas |
| Gàidhlig | gla-000 | staing |
| galego | glg-000 | problema |
| Српскохрватски | hbs-000 | проблем |
| Srpskohrvatski | hbs-001 | problem |
| עִברִית | heb-003 | בְּעָיָה |
| Hiligaynon | hil-000 | palaligban |
| Hiligaynon | hil-000 | problema |
| हिन्दी | hin-000 | प्रश्न |
| हिन्दी | hin-000 | मसला |
| हिन्दी | hin-000 | समस्या |
| magyar | hun-000 | baj |
| magyar | hun-000 | gond |
| magyar | hun-000 | probléma |
| արևելահայերեն | hye-000 | խնդիր |
| bahasa Indonesia | ind-000 | masalah |
| bahasa Indonesia | ind-000 | tantangan |
| íslenska | isl-000 | vandamál |
| italiano | ita-000 | impresa |
| italiano | ita-000 | problema |
| italiano | ita-000 | sfida |
| 日本語 | jpn-000 | チャレンジ |
| 日本語 | jpn-000 | 問題 |
| 日本語 | jpn-000 | 挑戦 |
| ქართული | kat-000 | პრობლემა |
| қазақ | kaz-000 | мәселе |
| қазақ | kaz-000 | проблема |
| монгол | khk-000 | төвөгтэй асуудал |
| монгол | khk-000 | хүндрэл |
| ភាសាខ្មែរ | khm-000 | ចំណោទ |
| кыргыз | kir-000 | көйгөй |
| кыргыз | kir-000 | маселе |
| кыргыз | kir-000 | проблема |
| 한국어 | kor-000 | 도전 |
| 한국어 | kor-000 | 문제 |
| ລາວ | lao-000 | ບັນຫາ |
| lietuvių | lit-000 | problema |
| latviešu | lvs-000 | problēma |
| македонски | mkd-000 | про́блем |
| Malti | mlt-000 | problema |
| lhéngua mirandesa | mwl-000 | porblema |
| မြန်မာဘာသာ | mya-000 | ပြဿနာ |
| Tâi-gí | nan-003 | bĕ |
| Tâi-gí | nan-003 | bī |
| Tâi-gí | nan-003 | iàu-tiám |
| Tâi-gí | nan-003 | lăn-sū |
| Tâi-gí | nan-003 | lăn-tĕ |
| napulitano | nap-000 | prubblema |
| Nederlands | nld-000 | probleem |
| Nederlands | nld-000 | uitdaging |
| nynorsk | nno-000 | problem |
| bokmål | nob-000 | problem |
| bokmål | nob-000 | utfordring |
| occitan | oci-000 | problèma |
| فارسی | pes-000 | مسئله |
| فارسی | pes-000 | مشکل |
| فارسی | pes-000 | چالش |
| polski | pol-000 | kłopot |
| polski | pol-000 | problem |
| polski | pol-000 | wyzwanie |
| português | por-000 | desafio |
| português | por-000 | problema |
| română | ron-000 | problemă |
| română | ron-000 | provocare |
| русский | rus-000 | вы́зов |
| русский | rus-000 | головоломка |
| русский | rus-000 | испыта́ние |
| русский | rus-000 | пробле́ма |
| русский | rus-000 | сло́жная зада́ча |
| русский | rus-000 | сложная тема |
| русский | rus-000 | тру́дная зада́ча |
| русский | rus-000 | трудный вопрос |
| русский | rus-000 | тяжелая задача |
| русский | rus-000 | че́ллендж |
| संस्कृतम् | san-000 | समस्या |
| slovenčina | slk-000 | problém |
| slovenščina | slv-000 | problem |
| español | spa-000 | desafío |
| español | spa-000 | dificultad |
| español | spa-000 | lío |
| español | spa-000 | problema |
| shqip | sqi-000 | problem |
| shqip | sqi-000 | çështje |
| svenska | swe-000 | problem |
| svenska | swe-000 | utmaning |
| Kiswahili | swh-000 | changa moto |
| Kiswahili | swh-000 | masaibu |
| Kiswahili | swh-000 | tatizo |
| татарча | tat-001 | мәсьәлә |
| тоҷикӣ | tgk-000 | масъала |
| тоҷикӣ | tgk-000 | мушкил |
| тоҷикӣ | tgk-000 | проблема |
| Tagalog | tgl-000 | problema |
| ภาษาไทย | tha-000 | ปัญหา |
| türkmençe | tuk-000 | mesele |
| türkmençe | tuk-000 | problem |
| türkmençe | tuk-000 | problema |
| Türkçe | tur-000 | problem |
| Türkçe | tur-000 | sorun |
| ʻgana Tuvalu | tvl-000 | fakalavelave |
| українська | ukr-000 | пробле́ма |
| oʻzbek | uzn-000 | masala |
| oʻzbek | uzn-000 | muammo |
| oʻzbek | uzn-000 | problema |
| tiếng Việt | vie-000 | thách thức |
| tiếng Việt | vie-000 | thử thách |
| tiếng Việt | vie-000 | vấn đề |
| ייִדיש | ydd-000 | פּראָבלעם |
| Maaya Tʼaan | yua-000 | toop |
| Ngazidja Comorian | zdj-000 | shaka |
| Bahasa Malaysia | zsm-000 | kemusykilan |
| Bahasa Malaysia | zsm-000 | kesulitan |
| Bahasa Malaysia | zsm-000 | masalah |