Adventure
Merge Letters uses letter forms in a fighting game, so familiar spelling knowledge does not establish the combination rules.
Identify what a letter represents here
Merge Letters ; Merge Alphabet describes combining alphabet characters and fighting battles. Treat the visible letters as game pieces whose functions must be learned from the actual interface. Knowing that one letter follows another in English does not prove how this game's merges work. Before making a combination, inspect the offered relationship between the selected pieces and whatever preview or instruction the game provides.
Keep merging and fighting connected
After a combination, look at the force available for the next fight. Which piece changed, and what information now describes it? The interesting question is how that change contributes to the encounter, not whether the new letter is later in the alphabet. The listing does not supply damage values or a complete evolution table, so the visible unit information is a better reference than an imagined universal sequence.
Use an encounter to test one expectation
Choose one effect you expect from the changed piece based on the information actually shown. During the fight, watch for that contribution and inspect the result afterward. A win or loss involves the whole encounter, so avoid treating it as proof that every possible merge choice has been ranked. A clear connection between one combination and one observed combat question gives the alphabet theme a practical strategic meaning.