Around 4 hours 33 minutes to beat. This game has 2 very hard parts solo. Stage 21 and the final boss fight. Stage 21 alone took me around 2 hours 9 minutes. Playthroughs online only show the game in co-op , which is much easier or fully powered up at the start of a stage. This playthrough will show many of the stages with no starting power ups, including the final boss. This tutorial will break down all the strategies I used and is edited down further from the version with no commentary. I found alot of exploits and strategies to use against the AI.
For this tutorial I edited it down to show only successful stage completions. This means that I dont show the sets of lives where I failed to complete the stage. Often Im showing a stage completion with no starting power ups from a fresh continue or whatever I carried over from a previous stage if I beat several stages in a row. This game has unlimited continues but you only have maybe 3 lives to beat a stage , and will restart the stage if you lose those lives.
While enemy numbers seem to increase with more players present, parts of this game really feel designed for Co-op play as solo gets pretty wild in a few areas. The final stage feels like a FUCK YOU to arcade players unless you find a very specific strategy that I found. There are no power ups on the final stage and the turrets take a shitload of hits with the base pellet gun.