Memory
Echo Grid
Watch the pattern light up. Echo it back. It only gets longer.
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Memory / DAY 013
Chain Sum
Link neighboring numbers. Use the exact tile count and hit the target sum.
How to play
- 1
Start anywhere, then link only tiles that share an edge — no diagonals.
- 2
Use exactly the number of tiles shown and make their total equal Σ.
- 3
Tap the last tile to undo. Solve as many boards as you can before time runs out.
Why it works
Chain Sum combines mental addition with spatial planning: every value changes the total, while adjacency limits which number can come next. Instead of answering one equation, you compare possible routes, notice dead ends, and revise a chain before committing.
FAQ
What counts as a valid chain?
Every new tile must share a side with the previous tile, no tile may be reused, and both the required length and target sum must match exactly.
Should I add first or trace a path first?
Do both in short chunks. Find a promising pair, check which neighbors can finish the total, then extend only if the route still fits.
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