NN555Drop

Drop tokens into a 7x6 board and try to connect four before your opponent does. Play locally against a rule-based AI with three difficulty levels, or share one device for a two-player match. Use the built-in preview to plan drops, block threats, and learn how gravity changes every turn. Practice mode includes more than 36 tactical drills focused on one-move wins, only-defense situations, and double-threat creation. A guided tutorial shows the basics through playable positions, not static text. The app also includes move confirmation, legal-column hints, token style options, sound and animation toggles, local statistics, replay playback, and unfinished match resume. Everything works offline. No account, no online matchmaking, no chat, no ads, and no payment flow.