Hanzi characters do not represent sounds and tones directly. To be literate in Chinese, a person has to remember the pronunciations of thousands complicated characters largely by rote. A Chinese student typically spends years on this tedious task; for an adult, especially an adult learning Chinese as a second language, this is an almost insurmountable barrier.
Pinyin uses Latin alphabet for transcribing the Mandarin pronunciations of Hanzi characters, and uses diacritics for marking the tones. A Hanzi character is pronounced as one pinyin syllable, which includes one or zero initial and one final.
Pinyinz is derived from pinyin. It is so simple that it can be learned in a single day. For a person who has already learned pinyin, pinyinz can be learned in less than an hour.
This website lets you choose the number of Hanzi characters you know and displays other Hanzi characters as pinyinz, so that you can start reading Chinese immediately after learning the initials, finals, tones of pinyinz.