In vanilla PvZ, sun management is straightforward. In Upgraliam 1.0, the sun has become sentient. The mod introduces Weather Cycles. On odd-numbered levels (1, 3, 5), you play under a "Harvest Moon" where sunflowers produce 50 sun. On even-numbered levels, a "Solar Eclipse" occurs, reducing all passive sun generation by 75%. You are forced to rely on aggressive sun-shrooms or the new "Solar Flare Kernel" plant, which sacrifices its life for a massive 300-sun drop.
Of course, the undead aren't just standing around. The mod introduces Zombie Leaders. Every third flag, a random Lieutenant Zombie spawns. If not killed within 45 seconds, it uses a Tactical Ability. Plants vs Zombies Upgraliam 1.0 Mod
If the original PvZ was a casual stroll, Upgraliam is a marathon. In vanilla PvZ, sun management is straightforward