Choose a mode
Build the sum using each digit's − / + buttons (hundreds, tens, ones), or drag up over a column to add a crystal. When a column fills past 9, an ore cart rides the rail to carry the group to the next place. Press Check to check
Build the sum using each digit's − / + buttons (hundreds, tens, ones), or drag up over a column to add a crystal. When a column fills past 9, an ore cart rides the rail to carry the group to the next place. Press Check to check
3D math game · Best for grades 2-4
Build the sum of the addition from ore crystals in an underground mine
Carrying tens and hundreds in the mine turns regrouping in addition into visible movement between columns.
The game builds understanding of Arithmetic. Build the sum using each digit's − / + buttons (hundreds, tens, ones), or drag up over a column to add a crystal. When a column fills past 9, an ore cart rides the rail to carry the group to the next place. Press Check to check
calculation, number composition, place value, and basic operations.
Students see the quantity, adjust it directly, and check the result immediately.
This builds number sense instead of relying only on memorized answers.
Use it for individual practice, paired work, or a short class demonstration before worksheets.
Start with the game above, then continue with written practice to reinforce the skill.