3037. Starting with "一", add one stroke each time, until you reach "玉", and each intermediate character must have a meaning too!

一 -> 十 -> 土 -> 王-> 玉

Add a single stroke each time to make a new character.

一 ICHI, ITSU, hito(tsu) - one

十 JUU, tou, to - ten

土 DO, tsuchi - earth, soil

王 OU - king

玉 GYOKU, tama - jewel