This simulator puts you in the position of a new entrant fighting three established incumbents for market share, one quarter at a time. Every quarter you set a price, a marketing budget and a product-quality investment; a multiplicative attraction (logit-share) model — the same class of model used in real marketing-science demand estimation — turns those choices, and the incumbents' fixed competitive strategies, into a market-share split, unit sales, profit and cash runway. Price too low and margins collapse even as share grows; price too high and an incumbent discounter eats your demand; spend nothing on marketing or quality and you fade into irrelevance. Run the clock forward and watch whether your entry strategy survives long enough to become profitable, or burns through its cash and exits the market.