Board Thread:Plants vs. Zombies Wiki Discussion/@comment-4009269-20140213201430/@comment-5792287-20140724085553

Based on what I know of the Chinese version, it's MUCH harder than the International Version. Despite the free prem plants, it's designed as a pay-to-win game, meaning that if you don't spend any real money, it'll be near-impossible to beat 100%.

In the International version however, the only time you really need to spend money is to get to the REALLY high levels in Endless Zones.