Spacyy

Connections Hint compiles all answers and puzzle hints for The New York Times' Connections game since its launch, completely free with daily updates.

cpstest is a web-based tool for testing mouse click speed, evaluating concentration, measuring reaction speed, and providing fun, focused training.

Simple online tests for reaction time, memory, and focus

自动识别公开牌面、追踪剩余牌，支持斗地主、跑得快、掼蛋，提供 iOS 与 Android 版本。

Experience 3D moon block casting online: watch the two blocks fall naturally and check if you get a holy block, laughing block, or yin block.

One brutal puzzle a day. Sharpen your brain in minutes.