Best problem solving game on iPad

A fine game, with LOTS of future potential.
Would love to see puzzles with ALL operators available - with a variety of goals.... Fastest solution on first play; Least number of operators used; most operators used; longest/shortest paths of dot; add additional colored dots - red go to X, white go to Y --- from different OR the same source.

So many possibilities.

darkumbra about [the Sequence], v1.3