A moonlit limestone courtyard. Numbered glass rain orbs slide down wet stone channels. Tap two that add to the sum on the well plaque. A match melts into the cistern. A miss cracks and resets the streak. If the wall fills, a life is lost. Built for first- and second-grade addition facts.
Read the Sum
The plaque above the wall shows a target such as 10. You need two orbs whose numbers add to that target.
Tap Two Orbs
Tap the first addend, then the second. A match glows and drops into the well. A miss is not that pair.
Watch the Wall
New glass keeps sliding down the channels. Clear pairs before the wall fills to the top.
Fill the Cistern
Twelve pairs win. Three overflows end the run. Remaining lives add a bonus on a win.
Read the Well
A stone plaque names the sum. On Easy it stays 10. Later rounds move through 10–20, then 14–24.
Pair the Glass
Orbs fall down five wet channels. Tap one, then its partner. Only the pair that adds to the plaque is taken.
Streak and Overflow
Hits stack a streak bonus. A wrong pair clears the streak. If every channel fills, the wall overflows and you lose a life.
Twelve Pairs
Twelve good pairs fill the cistern and win. Three overflows end the run. Best scores save per difficulty.
Cistern Pair is an addition pairing game. Numbered glass orbs slide down a wet limestone wall in a moonlit courtyard. A plaque names a sum. The player taps two orbs that add to that sum. Matches fall into a stone cistern. The goal is twelve pairs before three overflows.
Facts Under Motion
Orbs keep falling, so students hunt 3 + 7 while the wall fills—not on a static worksheet.
Two Addends, One Place
The answer is a pair on the wall, not a button under a prompt. You tap the glass.
Near-Miss Numbers
A 4 and an 8 sit next to a needed 6 when the sum is 10, so students add, not guess by look.
Grows With the Sum
Easy stays on 10. Medium moves through 10–20. Hard uses 14–24 and a faster fall.
Pairs such as 1 + 9, 2 + 8, 3 + 7, 4 + 6, and 5 + 5. The wall always holds at least one true pair.
Tap the first glass orb, then tap the second. If they add to the plaque, they drop into the well.
The streak resets and the orbs stay on the wall. You do not lose a life for a miss.
The target sums and how fast new glass falls. Easy stays with make-10.
First and second grade (about ages 6–8). Stay on Easy for addition facts to 10.