How many letters does the top answer for “which game is not part of the science adventure series by 5pb. and nitroplus” have?

The most common answer is nine (4 letters).

Crossword clue: which game is not part of the science adventure series by 5pb. and nitroplus

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

nine 4 letters otdb

the cardinal number that is the sum of eight and one

occultic 8 letters otdb