Default Controls
← → ↑ ↓ = Directions
Z = A, X = B
A = X, S = Y
D = L, C = R
Enter (↵) = Start
Shift = Select
About the Mario’s Keep Co-Op 1.00 Nintendo Entertainment System (NES) Online Game
Welcome to Mario’s Keep Co-Op 1.00! Play this NES game online for free in your browser. Join forces with a friend and embark on a co-op adventure with Mario. No downloads required, just click and play. Have fun exploring levels, defeating enemies, and collecting coins together. Team up to overcome obstacles and reach the end goal. Ready to save the princess and have a blast? Let’s go!