Equation: OOOH + FOOD = FIGHT. Each of the 7 unique letters (D, F, G, H, I, O, T) represents a different digit. Leading letters (O, F) cannot be zero.

O=8, H=6, F=1, D=3, I=0, G=7, T=9 → 8886 + 1883 = 10769

OOOH + FOOD = FIGHT

What is this puzzle?

Solve the addition alphametic puzzle where OOOH + FOOD = FIGHT. Each letter represents a unique digit from 0-9. No number starts with zero.

Difficulty: medium · Category: addition · Unique letters: 7

This medium-level addition alphametic puzzle features 7 unique letters (D, F, G, H, I, O, T). In the equation OOOH + FOOD = FIGHT, each letter maps to a distinct digit from 0 to 9. With only 7 of 10 digits used, 3 digits remain unused in the solution. The leading letters O and F cannot represent zero — this is your first constraint. The result "FIGHT" has more digits than any addend, which means there must be a carry into the leftmost position. This is a crucial clue for determining the result's leading letter.

This addition alphametic has 7 unique letters to determine.
Leading letters: O, F. None of these can be zero.
There are 7 unique letters, so 3 digits from 0–9 will not be used.
Start from the rightmost column (units place) and work left, tracking carries between columns.
With two addends, each column can produce a carry of at most 1.
A moderate number of letters means you'll need logical deduction alongside trial and error.