All Zero Puzzle play online

Can you find correct numbers in some numbers?

This is a puzzle game that delete all numbers of question.
The rule is simple, but a difficulty increases step by step.


Rule
(1) There are "Question panels" on top of the screen. There are "Answer panels" on bottom of the screen.
(2) You select an "Answer panel" and drop on a "Question Panel". Then number of "Question panel" changes.
(before: Q=3, A=2 ---> 3-2=1 --> after: Q=1)
(3) If all numbers of "Question panels" are zero (not minus), you clear the level.


Feature
All 150 level are free.
The difficulty increases step by step.
There is "Today's question". You can play a different game everyday. It is updated at 0:00(UTC+9).
There is a support function. That is red panel which tells you possible of the correct panel.
There is a support function. That is "undo" function.
This game is a practice of "Addition" and "Subtraction".
You can use a "Hint" function.
There is a leaderboard (Game Center).
There is not a time limit. You can think long time.